Common Weakness Enumeration
CWE-208
AllowedObservable Timing Discrepancy
Abstraction: Base · Status: Incomplete
Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.
392 vulnerabilities reference this CWE, most recent first.
CVE-2026-21840 (GCVE-0-2026-21840)
Vulnerability from cvelistv5 – Published: 2026-07-14 21:36 – Updated: 2026-07-15 12:46
VLAI
EPSS
VEX
Title
HCL BigFix Platform is affected by a user enumeration vulnerability
Summary
HCL BigFix Platform is affected by a user enumeration vulnerability which might allow an attacker, through careful system control and response time monitoring, to perform some level of user enumeration for the BigFix service.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 12:45 UTC
CWE
- CWE-208 - Observable timing discrepancy
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| HCLSoftware | HCL BigFix Platform |
Affected:
10.0.0 - 10.0.15, 11.0.0 - 11.0.5
|
Date Public
2026-07-14 21:36
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CVE-2026-18259 (GCVE-0-2026-18259)
Vulnerability from cvelistv5 – Published: 2026-08-25 22:21 – Updated: 2026-08-26 18:42
VLAI
EPSS
VEX
Title
Token Content Access - Moderately critical - Access bypass - SA-CONTRIB-2026-090
Summary
Observable Timing Discrepancy vulnerability in Drupal Token Content Access allows Brute Force. This issue affects Token Content Access versions: from 0.0.0 to 3.1.2.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 18:42 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Drupal | Token Content Access |
Affected:
0.0.0 , < 3.1.2
(semver)
|
Date Public
2026-07-29 17:08
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CVE-2026-18040 (GCVE-0-2026-18040)
Vulnerability from cvelistv5 – Published: 2026-10-03 08:55 – Updated: 2026-10-05 16:00
VLAI
EPSS
VEX
Title
HQC leaks private key information through secret-indexed GF(2^8) tables and a secret-dependent fixed-weight sampler
Summary
In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF(2^8) arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a collision was found and stored accepted positions at a secret index. Both run on secret inputs during encapsulation and decapsulation, and the sampler re-expands the secret key from its seed on every decapsulation, so an attacker able to observe cache behaviour or decapsulation timing can recover information about the HQC private key. The field arithmetic is now table-free and the sampler branch-free within a batch of candidates, with output and randomness consumption unchanged.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-05 16:00 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bcgit/bc-java/wiki/CVE%E2%80%9… | vendor-advisory |
| https://github.com/bcgit/bc-java/commit/283acd810… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Legion of the Bouncy Castle Inc. | BC-JAVA |
Affected:
1.73 , < 1.86
(maven)
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CVE-2026-18036 (GCVE-0-2026-18036)
Vulnerability from cvelistv5 – Published: 2026-10-02 07:54 – Updated: 2026-10-02 17:42
VLAI
EPSS
VEX
Title
NTRU leaks private key information by reducing secret values with a non-constant-time integer division
Summary
In Bouncy Castle for Java before 1.86, NTRU reduced secret values with the % operator in three helpers whose reference implementations are deliberately division-free, so each reduction was carried out by an integer division whose latency depends on the secret operand. Polynomial.modQ divided by a variable divisor, which a compiler cannot strength-reduce to a multiply the way it can a constant one, so it emitted a division on every call including on the decapsulation path where the dividend derives from the private key; Polynomial.mod3 and NTRUSampling.mod3 divided the secret key polynomials f and g during key generation, the message polynomials r and m during encapsulation, and coefficients recovered during decapsulation. An attacker able to measure that timing can recover information about the NTRU private key. modQ now masks, which is exact because q is always a power of two, and mod3 uses the reference implementation's division-free fold and select; the results are unchanged.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 17:42 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bcgit/bc-java/wiki/CVE%E2%80%9… | vendor-advisory |
| https://github.com/bcgit/bc-java/commit/9c9ad88b6… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Legion of the Bouncy Castle Inc. | BC-JAVA |
Affected:
1.73 , < 1.86
(maven)
|
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CVE-2026-16731 (GCVE-0-2026-16731)
Vulnerability from cvelistv5 – Published: 2026-08-06 13:14 – Updated: 2026-08-06 14:43
VLAI
EPSS
VEX
Title
Authentication and authorization bypass via cryptographic timing side-channel attack in StationScout
Summary
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Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 14:43 UTC
CWE
- CWE-208 - Observable timing discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.omicronenergy.com/.well-known/csaf/os… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OMICRON electronics GmbH | OMICRON StationScout |
Affected:
0 , < 3.05
(semver)
cpe:2.3:a:omicron_electronics_gmbh:omicron_stationscout:*:*:*:*:*:*:*:* |
Date Public
2026-07-31 07:00
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CVE-2026-16459 (GCVE-0-2026-16459)
Vulnerability from cvelistv5 – Published: 2026-08-13 08:29 – Updated: 2026-08-13 14:24
VLAI
EPSS
VEX
Title
Timing side-channel in RSA PKCS#1 v1.5 decryption in Oberon PSA Crypto
Summary
Padding oracle attack vulnerability in Oberon microsystem AG’s Oberon PSA Crypto library in all versions since 1.0.0 and prior to 2.1.1 allows an attacker to recover plaintexts via timing measurements of RSA PKCS#1 v1.5 decrypt operations.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:23 UTC
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Oberon microsystems AG | Oberon PSA Crypto |
Affected:
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CVE-2026-16458 (GCVE-0-2026-16458)
Vulnerability from cvelistv5 – Published: 2026-08-13 08:31 – Updated: 2026-08-13 14:26
VLAI
EPSS
VEX
Title
Timing side-channel in RSA PKCS#1 v1.5 decryption in ocrypto
Summary
Padding oracle attack vulnerability in Oberon microsystem AG’s ocrypto library in all versions since 3.0.0 and prior to 4.0.1 allows an attacker to recover plaintexts via timing measurements of RSA PKCS#1 v1.5 decrypt operations.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:25 UTC
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Oberon microsystems AG | ocrypto |
Affected:
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CVE-2026-16315 (GCVE-0-2026-16315)
Vulnerability from cvelistv5 – Published: 2026-08-06 13:14 – Updated: 2026-08-06 14:44
VLAI
EPSS
VEX
Title
Authentication and authorization bypass via cryptographic timing side-channel attack in StationGuard
Summary
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Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 14:44 UTC
CWE
- CWE-208 - Observable timing discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.omicronenergy.com/.well-known/csaf/os… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OMICRON electronics GmbH | OMICRON StationGuard |
Affected:
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Date Public
2026-07-31 07:00
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CVE-2026-16037 (GCVE-0-2026-16037)
Vulnerability from cvelistv5 – Published: 2026-09-08 15:12 – Updated: 2026-10-01 12:41
VLAI
EPSS
VEX
Title
Callback Authentication Bypass via Timing Attack in PayTR's PayTR Virtual Pos iFrame API WHMCS Module
Summary
Observable timing discrepancy vulnerability in PayTR Payment and Electronic Money Institution Inc. PayTR Virtual Pos iFrame API WHMCS Module allows Black Box Reverse Engineering.
This issue affects PayTR Virtual Pos iFrame API WHMCS Module: from v9.0.0 before v9.0.3.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 15:47 UTC
CWE
- CWE-208 - Observable timing discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://siberguvenlik.gov.tr/guvenlik-bildirimler… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| PayTR Payment and Electronic Money Institution Inc. | PayTR Virtual Pos iFrame API WHMCS Module |
Affected:
v9.0.0 , < v9.0.3
(semver)
|
Date Public
2026-09-08 15:07
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CVE-2026-15432 (GCVE-0-2026-15432)
Vulnerability from cvelistv5 – Published: 2026-07-21 16:42 – Updated: 2026-07-22 18:27
VLAI
EPSS
VEX
Title
Observable Timing Discrepancy in Tink-Java and Tink-Android ChunkedMacVerification
Summary
When verifying a mac with a ChunkedMacVerification object, Tink compares the resulting tag with non constant time comparison. This potentially allows an attacker to use timinig information as a side channel in order to get information how many bytes of a given tag match the correct tag. This in turn could allow to find a correct tag bytewise.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-22 18:13 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Tink-Java |
Affected:
All releases before 1.21.0, including 1.21.0.
|
||
| Tink-Android |
Affected:
All releases before 1.21.0, including 1.21.0.
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No mitigation information available for this CWE.
CAPEC-462: Cross-Domain Search Timing
An attacker initiates cross domain HTTP / GET requests and times the server responses. The timing of these responses may leak important information on what is happening on the server. Browser's same origin policy prevents the attacker from directly reading the server responses (in the absence of any other weaknesses), but does not prevent the attacker from timing the responses to requests that the attacker issued cross domain.
CAPEC-541: Application Fingerprinting
An adversary engages in fingerprinting activities to determine the type or version of an application installed on a remote target.
CAPEC-580: System Footprinting
An adversary engages in active probing and exploration activities to determine security information about a remote target system. Often times adversaries will rely on remote applications that can be probed for system configurations.