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Vulnerabilities

Vulnerability · CVE-2025-11931

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt.

Published Nov 21, 2025 · catalog updated Dec 8, 2025 · wolfSSL wolfSSL

Last checked Oct 28, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-11931. EPSS is 0.34%. Act only if a listed version of wolfSSL wolfSSL is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Low2.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.34%
Remediation
Version ranges on file
Affected products
vendor wolfSSL wolfSSL 0 <5.8.4

Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wc_XChaCha20Poly1305_Decrypt() which is not used with TLS connections, only from direct calls from an application.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor wolfSSL wolfSSL 0 <5.8.40 <5.8.4

How to fix CVE-2025-11931

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-11931. EPSS is 0.34%. Act only if a listed version of wolfSSL wolfSSL is installed.

Which versions are affected?

Compare what you have installed with wolfSSL wolfSSL 0 <5.8.4 0 <5.8.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.34%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 21, 2025 · EUVD

    Detected

    Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wc_XChaCha20Poly1305_Decrypt() which is not used with TLS connections, only from direct calls from an application.

  2. Dec 8, 2025 · EUVD

    Updated

    Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wc_XChaCha20Poly1305_Decrypt() which is not used with TLS connections, only from direct calls from an application.

Sources

  • CVE.orgVulnerability recordCVE-2025-11931

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-11931

    30-day exploitation probability 0.34%

    first.org
  • EUVDVulnerability recordEUVD-2025-198522

    Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wc_XChaCha20Poly1305_Decrypt() which is not used with TLS connections, only from direct calls from an application.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 28, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 28, 2026
  • CVE.orgOct 28, 2026
  • EUVDOct 27, 2026