Vulnerability · CVE-2025-13151
Stack-based buffer overflow in libtasn1 version: v4.20.0.
Published Jan 7, 2026 · catalog updated Jan 20, 2026 · GnuTLS
Last checked Nov 2, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2025-13151. EPSS is 1.37%. Act only if a listed version of GnuTLS 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
- CVE-2021-46848 · Critical
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 1.37%
- Remediation
- Vendor / distro source
- Affected products
- vendor GnuTLS libtasn1 0 ≤4.20.0
Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.
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 GnuTLS libtasn1 0 ≤4.20.00 ≤4.20.0
How to fix CVE-2025-13151
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
Seen in 0 ≤4.20.0
Advisory
Open the cve_org record and follow its fix.
Official advisories
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-2025-13151. EPSS is 1.37%. Act only if a listed version of GnuTLS is installed.
Which versions are affected?
Compare what you have installed with GnuTLS libtasn1 0 ≤4.20.0 0 ≤4.20.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 1.37%. 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.
Jan 7, 2026 · EUVD
Detected
Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.
Jan 20, 2026 · EUVD
Updated
Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.
Sources
- CVE.orgVulnerability recordCVE-2025-13151
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2025-13151
30-day exploitation probability 1.37%
first.org - EUVDVulnerability recordEUVD-2025-206262
Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 2, 2026
- CVE.orgOct 30, 2026
- EUVDOct 30, 2026