5.3

CVE-2025-32989: gnu gnutls Improper Certificate Validation

CVSS: 5.3v3.1MediumModified
AliasesALPINE-CVE-2025-32989UBUNTU-CVE-2025-32989DEBIAN-CVE-2025-32989
Published 10-07-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-32989 is a medium (CVSS 5.3) Improper Certificate Validation vulnerability in gnu gnutls. EPSS estimates a 1.47% chance of exploitation in the next 30 days, higher than 73.2% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
1.47%
0%100%
Low · +0.18 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 14 · Related 7
DSA-5962-1MGASA-2025-0225OPENSUSE-SU-2025:15411-1RHSA-2025:16115RHSA-2025:16116RHSA-2025:17348

Timeline

  1. 10-07-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

A heap-buffer-overread vulnerability was found in GnuTLS in how it handles the Certificate Transparency (CT) Signed Certificate Timestamp (SCT) extension during X.509 certificate parsing. This flaw allows a malicious user to create a certificate containing a malformed SCT extension (OID 1.3.6.1.4.1.11129.2.4.2) that contains sensitive data. This issue leads to the exposure of confidential information when GnuTLS verifies certificates from certain websites when the certificate (SCT) is not checked correctly.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

1.47%

Chance of exploitation in the next 30 days

Percentile

73%

Versus all other CVEs

30-day change

+0.18 pp

From 1.29% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.47%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat2 products
Alpine1 product
  • gnutls< 3.8.12-r0 | < 3.8.11-r0
Debian1 product
  • gnutls28< 3.7.9-2+deb12u5 | < 3.8.9-3
Gnu1 product
Ubuntu1 product
  • gnutls28< 3.7.3-4ubuntu1.7 | All versions (No fix recorded) | < 3.7.3-4ubuntu1.7+Fips1 | < 3.8.3-1.1ubuntu3.4 | < 3.8.3-1.1ubuntu3.4+Fips1 | < 3.8.9-3ubuntu1

5 vendors · 6 products

References

19 links
Show all 19 references