Vulnerability in Gnu Gnutls
CVE-2025-32989
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.
Vulnerability class: Improper Certificate Validation
EPSS: 0.012 (64.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Gnu Gnutls
- Red Hat Ceph Storage 7 — versions sha256:4d2f9dc5b2b33ee1c77bbfabcbbb9f4d94d343b04c4de2e4f8b3b81a1f0fd2fe, 7
- Red Hat Discovery 2 — versions sha256:435ba9959b793d46a63a74c343bb8c3ff68350496afec12cc5e894dfc40b7648, 2.3.0-1760554384
- Red Hat Enterprise Linux 10 — versions 0:3.8.9-9.el10_0.14
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9 — versions 0:3.8.3-6.el9_6.2
- Red Hat Enterprise Linux 9.2 Update Services For Sap Solutions — versions 0:3.7.6-21.el9_2.4
- Red Hat Enterprise Linux 9.4 Extended Update Support — versions 0:3.8.3-4.el9_4.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- RHSA-2025:16115 (x_refsource_REDHAT, vendor-advisory)
- RHSA-2025:16116 (x_refsource_REDHAT, vendor-advisory)
- RHSA-2025:17181 (x_refsource_REDHAT, vendor-advisory)
- RHSA-2025:17348 (x_refsource_REDHAT, vendor-advisory)
- RHSA-2025:17361 (x_refsource_REDHAT, vendor-advisory)
- RHSA-2025:19088 (x_refsource_REDHAT, vendor-advisory)
- RHSA-2025:22529 (x_refsource_REDHAT, vendor-advisory)
- RHSA-2026:7477 (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vdb-entry, Vendor Advisory)
- RHBZ#2359621 (x_refsource_REDHAT, issue-tracking, Issue Tracking)
Frequently asked questions
- What is CVE-2025-32989?
- CVE-2025-32989 is a medium-severity vulnerability in Gnu Gnutls, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2025-07-10.
- How severe is CVE-2025-32989?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2025-32989 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.