Common Weakness Enumeration
CWE-502
AllowedDeserialization of Untrusted Data
Abstraction: Base · Status: Draft
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
5669 vulnerabilities reference this CWE, most recent first.
CVE-2021-21342 (GCVE-0-2021-21342)
Vulnerability from cvelistv5 – Published: 2021-03-22 23:40 – Updated: 2026-10-07 18:47
VLAI
EPSS
VEX
Title
A Server-Side Forgery Request can be activated unmarshalling with XStream to access data streams from an arbitrary URL referencing a resource in an intranet or the local host
Summary
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in a server-side forgery request. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 18:47 UTC
Assigner
References
15 references
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CVE-2021-21341 (GCVE-0-2021-21341)
Vulnerability from cvelistv5 – Published: 2021-03-22 23:40 – Updated: 2026-10-07 18:42
VLAI
EPSS
VEX
Title
XStream can cause a Denial of Service
Summary
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is vulnerability which may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service only by manipulating the processed input stream. No user is affected who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 18:41 UTC
Assigner
References
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CVE-2021-20318 (GCVE-0-2021-20318)
Vulnerability from cvelistv5 – Published: 2021-12-23 19:48 – Updated: 2024-08-03 17:37
VLAI
EPSS
VEX
Summary
The HornetQ component of Artemis in EAP 7 was not updated with the fix for CVE-2016-4978. A remote attacker could use this flaw to execute arbitrary code with the permissions of the application using a JMS ObjectMessage.
Severity
No CVSS data available.
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=2010559 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | Artemis in EAP 7 |
Affected:
7.3.9.GA, 7.4.0.GA
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CVE-2021-20190 (GCVE-0-2021-20190)
Vulnerability from cvelistv5 – Published: 2021-01-19 16:27 – Updated: 2025-08-27 20:36
VLAI
EPSS
VEX
Summary
A flaw was found in jackson-databind before 2.9.10.7. FasterXML mishandles the interaction between serialization gadgets and typing. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-08-27 20:35 UTC
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/FasterXML/jackson-databind/iss… | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=1916633 | x_refsource_MISC |
| https://lists.apache.org/thread.html/r380e9257bac… | mailing-listx_refsource_MLIST |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://www.oracle.com//security-alerts/cpujul2021.html | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2021021… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
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| n/a | jackson-databind |
Affected:
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CVE-2021-4451 (GCVE-0-2021-4451)
Vulnerability from cvelistv5 – Published: 2024-10-16 06:43 – Updated: 2026-04-08 16:38
VLAI
EPSS
VEX
Title
NinjaFirewall <= 4.3.3 - Authenticated PHAR Deserialization
Summary
The NinjaFirewall plugin for WordPress is vulnerable to Authenticated PHAR Deserialization in versions up to, and including, 4.3.3. This allows authenticated attackers to perform phar deserialization on the server. This deserialization can allow other plugin or theme exploits if vulnerable software is present (WordPress, and NinjaFirewall).
Severity
6.6 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-16 18:59 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| nintechnet | NinjaFirewall (WP Edition) – Advanced Security Plugin and Firewall |
Affected:
0 , < 4.3.4
(semver)
|
|
| ninjatechnologiesnetwork | ninja_firewall |
Affected:
0 , < 4.3.4
(custom)
cpe:2.3:a:ninjatechnologiesnetwork:ninja_firewall:*:*:*:*:*:*:*:* |
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CVE-2021-4178 (GCVE-0-2021-4178)
Vulnerability from cvelistv5 – Published: 2022-08-24 15:02 – Updated: 2024-08-03 17:16
VLAI
EPSS
VEX
Summary
A arbitrary code execution flaw was found in the Fabric 8 Kubernetes client affecting versions 5.0.0-beta-1 and above. Due to an improperly configured YAML parsing, this will allow a local and privileged attacker to supply malicious YAML.
Severity
No CVSS data available.
CWE
- CWE-502 - - Deserialization of Untrusted Data
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=2034388 | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2021-4178 | x_refsource_MISC |
| https://github.com/advisories/GHSA-98g7-rxmf-rrxm | x_refsource_MISC |
| https://github.com/fabric8io/kubernetes-client/is… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | kubernetes-client |
Affected:
Affects 5.x versions, Fixed in kubernetes-client v5.0.3 and above.
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CVE-2021-4118 (GCVE-0-2021-4118)
Vulnerability from cvelistv5 – Published: 2021-12-23 17:15 – Updated: 2024-08-03 17:16
VLAI
EPSS
VEX
Title
Deserialization of Untrusted Data in pytorchlightning/pytorch-lightning
Summary
pytorch-lightning is vulnerable to Deserialization of Untrusted Data
Severity
7.8 (High)
CWE
- CWE-502 - Deserialization of Untrusted Data
References
2 references
| URL | Tags |
|---|---|
| https://huntr.dev/bounties/31832f0c-e5bb-4552-a12… | x_refsource_CONFIRM |
| https://github.com/pytorchlightning/pytorch-light… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| pytorchlightning | pytorchlightning/pytorch-lightning |
Affected:
unspecified , < 1.6
(custom)
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CVE-2021-4104 (GCVE-0-2021-4104)
Vulnerability from cvelistv5 – Published: 2021-12-14 00:00 – Updated: 2026-05-28 19:53
VLAI
EPSS
VEX
Title
Deserialization of untrusted data in JMSAppender in Apache Log4j 1.2
Summary
JMSAppender in Log4j 1.2 is vulnerable to deserialization of untrusted data when the attacker has write access to the Log4j configuration. The attacker can provide TopicBindingName and TopicConnectionFactoryBindingName configurations causing JMSAppender to perform JNDI requests that result in remote code execution in a similar fashion to CVE-2021-44228. Note this issue only affects Log4j 1.2 when specifically configured to use JMSAppender, which is not the default. Apache Log4j 1.2 reached end of life in August 2015. Users should upgrade to Log4j 2 as it addresses numerous other issues from the previous versions.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2023-12-20 16:29 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
14 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Log4j 1.x |
Affected:
Apache Log4j 1.2 1.2.x
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CVE-2021-3838 (GCVE-0-2021-3838)
Vulnerability from cvelistv5 – Published: 2024-11-15 10:51 – Updated: 2024-11-18 14:41
VLAI
EPSS
VEX
Title
PHAR Deserialization in dompdf/dompdf
Summary
DomPDF before version 2.0.0 is vulnerable to PHAR deserialization due to a lack of checking on the protocol before passing it into the file_get_contents() function. An attacker who can upload files of any type to the server can pass in the phar:// protocol to unserialize the uploaded file and instantiate arbitrary PHP objects. This can lead to remote code execution, especially when DOMPdf is used with frameworks with documented POP chains like Laravel or vulnerable developer code.
Severity
9.8 (Critical)
9.8 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-18 14:40 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| dompdf | dompdf/dompdf |
Affected:
unspecified , < 2.0.0
(custom)
|
|
| dompdf | dompdf |
Affected:
0 , < 2.0.0
(custom)
cpe:2.3:a:dompdf:dompdf:*:beta3:*:*:*:*:*:* |
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CVE-2021-3040 (GCVE-0-2021-3040)
Vulnerability from cvelistv5 – Published: 2021-06-10 12:33 – Updated: 2024-09-16 18:23
VLAI
EPSS
VEX
Title
Bridgecrew Checkov: Unsafe deserialization of Terraform files allows code execution
Summary
An unsafe deserialization vulnerability in Bridgecrew Checkov by Prisma Cloud allows arbitrary code execution when processing a malicious terraform file. This issue impacts Checkov 2.0 versions earlier than Checkov 2.0.139. Checkov 1.0 versions are not impacted.
Severity
6.7 (Medium)
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://security.paloaltonetworks.com/CVE-2021-3040 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Palo Alto Networks | Bridgecrew Checkov |
Unaffected:
1.0 all
Affected: 2.0 , < 2.0.139 (custom) |
Date Public
2021-06-09 00:00
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Mitigation
Architecture and Design
Implementation
If available, use the signing/sealing features of the programming language to assure that deserialized data has not been tainted. For example, a hash-based message authentication code (HMAC) could be used to ensure that data has not been modified.
Mitigation
Implementation
When deserializing data, populate a new object rather than just deserializing. The result is that the data flows through safe input validation and that the functions are safe.
Mitigation
Implementation
Explicitly define a final object() to prevent deserialization.
Mitigation
Architecture and Design
Implementation
- Make fields transient to protect them from deserialization.
- An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.
Mitigation
Implementation
Avoid having unnecessary types or gadgets (a sequence of instances and method invocations that can self-execute during the deserialization process, often found in libraries) available that can be leveraged for malicious ends. This limits the potential for unintended or unauthorized types and gadgets to be leveraged by the attacker. Add only acceptable classes to an allowlist. Note: new gadgets are constantly being discovered, so this alone is not a sufficient mitigation.
Mitigation
Architecture and Design
Implementation
Employ cryptography of the data or code for protection. However, it's important to note that it would still be client-side security. This is risky because if the client is compromised then the security implemented on the client (the cryptography) can be bypassed.
Mitigation MIT-29
Operation
Strategy: Firewall
Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].
CAPEC-586: Object Injection
An adversary attempts to exploit an application by injecting additional, malicious content during its processing of serialized objects. Developers leverage serialization in order to convert data or state into a static, binary format for saving to disk or transferring over a network. These objects are then deserialized when needed to recover the data/state. By injecting a malformed object into a vulnerable application, an adversary can potentially compromise the application by manipulating the deserialization process. This can result in a number of unwanted outcomes, including remote code execution.