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72 vulnerabilities by PuTTY
CVE-2026-48852 (GCVE-0-2026-48852)
Vulnerability from nvd – Published: 2026-05-25 20:19 – Updated: 2026-05-26 12:39
VLAI
EPSS
VEX
Summary
PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 12:39 UTC
CWE
- CWE-617 - Reachable Assertion
Assigner
References
Impacted products
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CVE-2026-48851 (GCVE-0-2026-48851)
Vulnerability from nvd – Published: 2026-05-25 20:16 – Updated: 2026-05-26 12:40
VLAI
EPSS
VEX
Summary
PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust status is not cleared between proxy authentication and the main session.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 12:40 UTC
CWE
- CWE-451 - User Interface (UI) Misrepresentation of Critical Information
Assigner
References
Impacted products
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CVE-2026-48850 (GCVE-0-2026-48850)
Vulnerability from nvd – Published: 2026-05-25 20:13 – Updated: 2026-05-26 12:59
VLAI
EPSS
VEX
Summary
PuTTY 0.72 before 0.84 has a double free in RSA KEX.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 12:59 UTC
CWE
- CWE-415 - Double Free
Assigner
References
Impacted products
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CVE-2026-4115 (GCVE-0-2026-4115)
Vulnerability from nvd – Published: 2026-03-22 12:15 – Updated: 2026-05-25 01:42 Disputed X_Open Source
VLAI
EPSS
VEX
Title
PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification
Summary
A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c of the component Ed25519 Signature Handler. The manipulation results in improper verification of cryptographic signature. The attack may be performed from remote. The attack requires a high level of complexity. The exploitability is told to be difficult. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. The patch is identified as af996b5ec27ab79bae3882071b9d6acf16044549. It is advisable to implement a patch to correct this issue. The vendor was contacted early, responded in a very professional manner and quickly released a patch for the affected product. However, at the moment there is no proof that this flaw might have any real-world impact.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-23 15:32 UTC
CWE
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.352429 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.352429 | signaturepermissions-required |
| https://vuldb.com/?submit.775576 | third-party-advisory |
| https://github.com/py-thok/putty-ed25519-malleabi… | related |
| https://www.chiark.greenend.org.uk/~sgtatham/putt… | related |
| https://github.com/py-thok/putty-ed25519-malleabi… | exploit |
| https://git.tartarus.org/?p=simon/putty.git;a=com… | patch |
| https://www.rfc-editor.org/rfc/rfc8032#section-8.4 | related |
| http://www.openwall.com/lists/oss-security/2026/0… |
Impacted products
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CVE-2024-31497 (GCVE-0-2024-31497)
Vulnerability from nvd – Published: 2024-04-15 00:00 – Updated: 2025-11-04 22:06
VLAI
EPSS
VEX
Summary
In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an attacker to recover a user's NIST P-521 secret key via a quick attack in approximately 60 signatures. This is especially important in a scenario where an adversary is able to read messages signed by PuTTY or Pageant. The required set of signed messages may be publicly readable because they are stored in a public Git service that supports use of SSH for commit signing, and the signatures were made by Pageant through an agent-forwarding mechanism. In other words, an adversary may already have enough signature information to compromise a victim's private key, even if there is no further use of vulnerable PuTTY versions. After a key compromise, an adversary may be able to conduct supply-chain attacks on software maintained in Git. A second, independent scenario is that the adversary is an operator of an SSH server to which the victim authenticates (for remote login or file copy), even though this server is not fully trusted by the victim, and the victim uses the same private key for SSH connections to other services operated by other entities. Here, the rogue server operator (who would otherwise have no way to determine the victim's private key) can derive the victim's private key, and then use it for unauthorized access to those other services. If the other services include Git services, then again it may be possible to conduct supply-chain attacks on software maintained in Git. This also affects, for example, FileZilla before 3.67.0, WinSCP before 6.3.3, TortoiseGit before 2.15.0.1, and TortoiseSVN through 1.14.6.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-19 04:01 UTC
CWE
- n/a
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
32 references
Impacted products
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CVE-2023-48795 (GCVE-0-2023-48795)
Vulnerability from nvd – Published: 2023-12-18 00:00 – Updated: 2026-07-14 12:16
VLAI
EPSS
VEX
Summary
The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against SSH's use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in chacha20-poly1305@openssh.com and (if CBC is used) the -etm@openssh.com MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, PuTTY before 0.80, AsyncSSH before 2.14.2, golang.org/x/crypto before 0.17.0, libssh before 0.10.6, libssh2 through 1.11.0, Thorn Tech SFTP Gateway before 3.4.6, Tera Term before 5.1, Paramiko before 3.4.0, jsch before 0.2.15, SFTPGo before 2.5.6, Netgate pfSense Plus through 23.09.1, Netgate pfSense CE through 2.7.2, HPN-SSH through 18.2.0, ProFTPD before 1.3.8b (and before 1.3.9rc2), ORYX CycloneSSH before 2.3.4, NetSarang XShell 7 before Build 0144, CrushFTP before 10.6.0, ConnectBot SSH library before 2.2.22, Apache MINA sshd through 2.11.0, sshj through 0.37.0, TinySSH through 20230101, trilead-ssh2 6401, LANCOM LCOS and LANconfig, FileZilla before 3.66.4, Nova before 11.8, PKIX-SSH before 14.4, SecureCRT before 9.4.3, Transmit5 before 5.10.4, Win32-OpenSSH before 9.5.0.0p1-Beta, WinSCP before 6.2.2, Bitvise SSH Server before 9.32, Bitvise SSH Client before 9.33, KiTTY through 0.76.1.13, the net-ssh gem 7.2.0 for Ruby, the mscdex ssh2 module before 1.15.0 for Node.js, the thrussh library before 0.35.1 for Rust, and the Russh crate before 0.40.2 for Rust.
Severity
5.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2023-12-22 05:01 UTC
CWE
- n/a
- CWE-354 - Improper Validation of Integrity Check Value
Assigner
References
139 references
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| Siemens | RUGGEDCOM APE1808 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
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"cveMetadata": {
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"assignerShortName": "mitre",
"cveId": "CVE-2023-48795",
"datePublished": "2023-12-18T00:00:00.000Z",
"dateReserved": "2023-11-20T00:00:00.000Z",
"dateUpdated": "2026-07-14T12:16:07.168Z",
"state": "PUBLISHED"
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}
CVE-2021-36367 (GCVE-0-2021-36367)
Vulnerability from nvd – Published: 2021-07-09 00:00 – Updated: 2024-08-04 00:54
VLAI
EPSS
VEX
Summary
PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-02-22 20:07 UTC
CWE
- n/a
- CWE-345 - Insufficient Verification of Data Authenticity
Assigner
References
4 references
Impacted products
{
"containers": {
"adp": [
{
"affected": [
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CVE-2021-33500 (GCVE-0-2021-33500)
Vulnerability from nvd – Published: 2021-05-21 19:42 – Updated: 2024-08-03 23:50
VLAI
EPSS
VEX
Summary
PuTTY before 0.75 on Windows allows remote servers to cause a denial of service (Windows GUI hang) by telling the PuTTY window to change its title repeatedly at high speed, which results in many SetWindowTextA or SetWindowTextW calls. NOTE: the same attack methodology may affect some OS-level GUIs on Linux or other platforms for similar reasons.
Severity
7.5 (High)
CWE
- n/a
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.chiark.greenend.org.uk/~sgtatham/putt… | x_refsource_MISC |
| https://docs.ssh-mitm.at/puttydos.html | x_refsource_MISC |
| https://github.com/ssh-mitm/ssh-mitm-plugins/blob… | x_refsource_MISC |
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CVE-2020-14002 (GCVE-0-2020-14002)
Vulnerability from nvd – Published: 2020-06-29 00:00 – Updated: 2024-08-04 12:32
VLAI
EPSS
VEX
Summary
PuTTY 0.68 through 0.73 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client).
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
7 references
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CVE-2019-17069 (GCVE-0-2019-17069)
Vulnerability from nvd – Published: 2019-10-01 00:00 – Updated: 2024-08-05 01:33
VLAI
EPSS
VEX
Summary
PuTTY before 0.73 might allow remote SSH-1 servers to cause a denial of service by accessing freed memory locations via an SSH1_MSG_DISCONNECT message.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://lists.tartarus.org/pipermail/putty-announ… | |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisory |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisory |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisory |
| https://security.netapp.com/advisory/ntap-2019112… | |
| https://lists.debian.org/debian-lts-announce/2024… | mailing-list |
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CVE-2019-17068 (GCVE-0-2019-17068)
Vulnerability from nvd – Published: 2019-10-01 16:55 – Updated: 2024-08-05 01:33
VLAI
EPSS
VEX
Summary
PuTTY before 0.73 mishandles the "bracketed paste mode" protection mechanism, which may allow a session to be affected by malicious clipboard content.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://lists.tartarus.org/pipermail/putty-announ… | x_refsource_MISC |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| https://security.netapp.com/advisory/ntap-2019112… | x_refsource_CONFIRM |
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CVE-2019-17067 (GCVE-0-2019-17067)
Vulnerability from nvd – Published: 2019-10-01 16:55 – Updated: 2024-08-05 01:33
VLAI
EPSS
VEX
Summary
PuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets, which allows attackers to listen on the same port to steal an incoming connection.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://lists.tartarus.org/pipermail/putty-announ… | x_refsource_MISC |
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CVE-2019-9898 (GCVE-0-2019-9898)
Vulnerability from nvd – Published: 2019-03-21 02:31 – Updated: 2024-08-04 22:01
VLAI
EPSS
VEX
Summary
Potential recycling of random numbers used in cryptography exists within PuTTY before 0.71.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
11 references
| URL | Tags |
|---|---|
| https://www.chiark.greenend.org.uk/~sgtatham/putt… | x_refsource_MISC |
| http://www.securityfocus.com/bid/107523 | vdb-entryx_refsource_BID |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://security.netapp.com/advisory/ntap-2019032… | x_refsource_CONFIRM |
| https://security.netapp.com/advisory/ntap-2019040… | x_refsource_CONFIRM |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| https://seclists.org/bugtraq/2019/Apr/6 | mailing-listx_refsource_BUGTRAQ |
| https://www.debian.org/security/2019/dsa-4423 | vendor-advisoryx_refsource_DEBIAN |
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CVE-2019-9897 (GCVE-0-2019-9897)
Vulnerability from nvd – Published: 2019-03-21 02:31 – Updated: 2024-08-04 22:01
VLAI
EPSS
VEX
Summary
Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://www.chiark.greenend.org.uk/~sgtatham/putt… | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| https://seclists.org/bugtraq/2019/Apr/6 | mailing-listx_refsource_BUGTRAQ |
| https://security.netapp.com/advisory/ntap-2019040… | x_refsource_CONFIRM |
| https://www.debian.org/security/2019/dsa-4423 | vendor-advisoryx_refsource_DEBIAN |
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CVE-2019-9896 (GCVE-0-2019-9896)
Vulnerability from nvd – Published: 2019-03-21 02:31 – Updated: 2024-08-04 22:01
VLAI
EPSS
VEX
Summary
In PuTTY versions before 0.71 on Windows, local attackers could hijack the application by putting a malicious help file in the same directory as the executable.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://www.chiark.greenend.org.uk/~sgtatham/putt… | x_refsource_MISC |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| https://security.netapp.com/advisory/ntap-2019040… | x_refsource_CONFIRM |
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CVE-2019-9895 (GCVE-0-2019-9895)
Vulnerability from nvd – Published: 2019-03-21 02:31 – Updated: 2024-08-04 22:01
VLAI
EPSS
VEX
Summary
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://www.chiark.greenend.org.uk/~sgtatham/putt… | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
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| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| https://seclists.org/bugtraq/2019/Apr/6 | mailing-listx_refsource_BUGTRAQ |
| https://security.netapp.com/advisory/ntap-2019040… | x_refsource_CONFIRM |
| https://www.debian.org/security/2019/dsa-4423 | vendor-advisoryx_refsource_DEBIAN |
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CVE-2019-9894 (GCVE-0-2019-9894)
Vulnerability from nvd – Published: 2019-03-21 02:30 – Updated: 2024-08-04 22:01
VLAI
EPSS
VEX
Summary
A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71 can occur before host key verification.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
9 references
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CVE-2026-48852 (GCVE-0-2026-48852)
Vulnerability from cvelistv5 – Published: 2026-05-25 20:19 – Updated: 2026-05-26 12:39
VLAI
EPSS
VEX
Summary
PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 12:39 UTC
CWE
- CWE-617 - Reachable Assertion
Assigner
References
Impacted products
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CVE-2026-48851 (GCVE-0-2026-48851)
Vulnerability from cvelistv5 – Published: 2026-05-25 20:16 – Updated: 2026-05-26 12:40
VLAI
EPSS
VEX
Summary
PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust status is not cleared between proxy authentication and the main session.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 12:40 UTC
CWE
- CWE-451 - User Interface (UI) Misrepresentation of Critical Information
Assigner
References
Impacted products
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CVE-2026-48850 (GCVE-0-2026-48850)
Vulnerability from cvelistv5 – Published: 2026-05-25 20:13 – Updated: 2026-05-26 12:59
VLAI
EPSS
VEX
Summary
PuTTY 0.72 before 0.84 has a double free in RSA KEX.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 12:59 UTC
CWE
- CWE-415 - Double Free
Assigner
References
Impacted products
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CVE-2026-4115 (GCVE-0-2026-4115)
Vulnerability from cvelistv5 – Published: 2026-03-22 12:15 – Updated: 2026-05-25 01:42 Disputed X_Open Source
VLAI
EPSS
VEX
Title
PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification
Summary
A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c of the component Ed25519 Signature Handler. The manipulation results in improper verification of cryptographic signature. The attack may be performed from remote. The attack requires a high level of complexity. The exploitability is told to be difficult. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. The patch is identified as af996b5ec27ab79bae3882071b9d6acf16044549. It is advisable to implement a patch to correct this issue. The vendor was contacted early, responded in a very professional manner and quickly released a patch for the affected product. However, at the moment there is no proof that this flaw might have any real-world impact.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-23 15:32 UTC
CWE
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.352429 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.352429 | signaturepermissions-required |
| https://vuldb.com/?submit.775576 | third-party-advisory |
| https://github.com/py-thok/putty-ed25519-malleabi… | related |
| https://www.chiark.greenend.org.uk/~sgtatham/putt… | related |
| https://github.com/py-thok/putty-ed25519-malleabi… | exploit |
| https://git.tartarus.org/?p=simon/putty.git;a=com… | patch |
| https://www.rfc-editor.org/rfc/rfc8032#section-8.4 | related |
| http://www.openwall.com/lists/oss-security/2026/0… |
Impacted products
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CVE-2024-31497 (GCVE-0-2024-31497)
Vulnerability from cvelistv5 – Published: 2024-04-15 00:00 – Updated: 2025-11-04 22:06
VLAI
EPSS
VEX
Summary
In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an attacker to recover a user's NIST P-521 secret key via a quick attack in approximately 60 signatures. This is especially important in a scenario where an adversary is able to read messages signed by PuTTY or Pageant. The required set of signed messages may be publicly readable because they are stored in a public Git service that supports use of SSH for commit signing, and the signatures were made by Pageant through an agent-forwarding mechanism. In other words, an adversary may already have enough signature information to compromise a victim's private key, even if there is no further use of vulnerable PuTTY versions. After a key compromise, an adversary may be able to conduct supply-chain attacks on software maintained in Git. A second, independent scenario is that the adversary is an operator of an SSH server to which the victim authenticates (for remote login or file copy), even though this server is not fully trusted by the victim, and the victim uses the same private key for SSH connections to other services operated by other entities. Here, the rogue server operator (who would otherwise have no way to determine the victim's private key) can derive the victim's private key, and then use it for unauthorized access to those other services. If the other services include Git services, then again it may be possible to conduct supply-chain attacks on software maintained in Git. This also affects, for example, FileZilla before 3.67.0, WinSCP before 6.3.3, TortoiseGit before 2.15.0.1, and TortoiseSVN through 1.14.6.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-19 04:01 UTC
CWE
- n/a
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
32 references
Impacted products
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CVE-2023-48795 (GCVE-0-2023-48795)
Vulnerability from cvelistv5 – Published: 2023-12-18 00:00 – Updated: 2026-07-14 12:16
VLAI
EPSS
VEX
Summary
The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against SSH's use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in chacha20-poly1305@openssh.com and (if CBC is used) the -etm@openssh.com MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, PuTTY before 0.80, AsyncSSH before 2.14.2, golang.org/x/crypto before 0.17.0, libssh before 0.10.6, libssh2 through 1.11.0, Thorn Tech SFTP Gateway before 3.4.6, Tera Term before 5.1, Paramiko before 3.4.0, jsch before 0.2.15, SFTPGo before 2.5.6, Netgate pfSense Plus through 23.09.1, Netgate pfSense CE through 2.7.2, HPN-SSH through 18.2.0, ProFTPD before 1.3.8b (and before 1.3.9rc2), ORYX CycloneSSH before 2.3.4, NetSarang XShell 7 before Build 0144, CrushFTP before 10.6.0, ConnectBot SSH library before 2.2.22, Apache MINA sshd through 2.11.0, sshj through 0.37.0, TinySSH through 20230101, trilead-ssh2 6401, LANCOM LCOS and LANconfig, FileZilla before 3.66.4, Nova before 11.8, PKIX-SSH before 14.4, SecureCRT before 9.4.3, Transmit5 before 5.10.4, Win32-OpenSSH before 9.5.0.0p1-Beta, WinSCP before 6.2.2, Bitvise SSH Server before 9.32, Bitvise SSH Client before 9.33, KiTTY through 0.76.1.13, the net-ssh gem 7.2.0 for Ruby, the mscdex ssh2 module before 1.15.0 for Node.js, the thrussh library before 0.35.1 for Rust, and the Russh crate before 0.40.2 for Rust.
Severity
5.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2023-12-22 05:01 UTC
CWE
- n/a
- CWE-354 - Improper Validation of Integrity Check Value
Assigner
References
139 references
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| Siemens | RUGGEDCOM APE1808 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
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CVE-2021-36367 (GCVE-0-2021-36367)
Vulnerability from cvelistv5 – Published: 2021-07-09 00:00 – Updated: 2024-08-04 00:54
VLAI
EPSS
VEX
Summary
PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-02-22 20:07 UTC
CWE
- n/a
- CWE-345 - Insufficient Verification of Data Authenticity
Assigner
References
4 references
Impacted products
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CVE-2021-33500 (GCVE-0-2021-33500)
Vulnerability from cvelistv5 – Published: 2021-05-21 19:42 – Updated: 2024-08-03 23:50
VLAI
EPSS
VEX
Summary
PuTTY before 0.75 on Windows allows remote servers to cause a denial of service (Windows GUI hang) by telling the PuTTY window to change its title repeatedly at high speed, which results in many SetWindowTextA or SetWindowTextW calls. NOTE: the same attack methodology may affect some OS-level GUIs on Linux or other platforms for similar reasons.
Severity
7.5 (High)
CWE
- n/a
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.chiark.greenend.org.uk/~sgtatham/putt… | x_refsource_MISC |
| https://docs.ssh-mitm.at/puttydos.html | x_refsource_MISC |
| https://github.com/ssh-mitm/ssh-mitm-plugins/blob… | x_refsource_MISC |
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CVE-2020-14002 (GCVE-0-2020-14002)
Vulnerability from cvelistv5 – Published: 2020-06-29 00:00 – Updated: 2024-08-04 12:32
VLAI
EPSS
VEX
Summary
PuTTY 0.68 through 0.73 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client).
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
7 references
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CVE-2019-17067 (GCVE-0-2019-17067)
Vulnerability from cvelistv5 – Published: 2019-10-01 16:55 – Updated: 2024-08-05 01:33
VLAI
EPSS
VEX
Summary
PuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets, which allows attackers to listen on the same port to steal an incoming connection.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://lists.tartarus.org/pipermail/putty-announ… | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2019112… | x_refsource_CONFIRM |
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CVE-2019-17068 (GCVE-0-2019-17068)
Vulnerability from cvelistv5 – Published: 2019-10-01 16:55 – Updated: 2024-08-05 01:33
VLAI
EPSS
VEX
Summary
PuTTY before 0.73 mishandles the "bracketed paste mode" protection mechanism, which may allow a session to be affected by malicious clipboard content.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://lists.tartarus.org/pipermail/putty-announ… | x_refsource_MISC |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| https://security.netapp.com/advisory/ntap-2019112… | x_refsource_CONFIRM |
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CVE-2019-17069 (GCVE-0-2019-17069)
Vulnerability from cvelistv5 – Published: 2019-10-01 00:00 – Updated: 2024-08-05 01:33
VLAI
EPSS
VEX
Summary
PuTTY before 0.73 might allow remote SSH-1 servers to cause a denial of service by accessing freed memory locations via an SSH1_MSG_DISCONNECT message.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://lists.tartarus.org/pipermail/putty-announ… | |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisory |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisory |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisory |
| https://security.netapp.com/advisory/ntap-2019112… | |
| https://lists.debian.org/debian-lts-announce/2024… | mailing-list |
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CVE-2019-9898 (GCVE-0-2019-9898)
Vulnerability from cvelistv5 – Published: 2019-03-21 02:31 – Updated: 2024-08-04 22:01
VLAI
EPSS
VEX
Summary
Potential recycling of random numbers used in cryptography exists within PuTTY before 0.71.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
11 references
| URL | Tags |
|---|---|
| https://www.chiark.greenend.org.uk/~sgtatham/putt… | x_refsource_MISC |
| http://www.securityfocus.com/bid/107523 | vdb-entryx_refsource_BID |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://security.netapp.com/advisory/ntap-2019032… | x_refsource_CONFIRM |
| https://security.netapp.com/advisory/ntap-2019040… | x_refsource_CONFIRM |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| https://seclists.org/bugtraq/2019/Apr/6 | mailing-listx_refsource_BUGTRAQ |
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