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Fencer Vulns
medium 5.3

CVE-2025-32989 json

Gnutls: vulnerability in gnutls sct extension parsing

published 2025-07-10 16 mo ago modified 2026-11-05 3 d ago also EUVD-2025-20927

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:3.8.9-9.el10_0.14
  • Red Hat Red Hat Enterprise Linux 9 0:3.8.3-6.el9_6.2
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:3.7.6-21.el9_2.4
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:3.8.3-4.el9_4.4
  • Red Hat Red Hat Ceph Storage 7 7
  • Red Hat Red Hat Discovery 2 2.3.0-1760554384
  • Red Hat Red Hat Hardened Images 3.8.12-1.1.hum1
  • Red Hat Red Hat Insights proxy 1.5 1.5.7-1759331989
  • gnutls28 Debian 12 3.7.9-2+deb12u5
  • gnutls28 Debian 14, Debian 13 3.8.9-3

debian advisories DEBIAN-CVE-2025-32989

  • gnutls28 Ubuntu 22.04 LTS 3.7.3-4ubuntu1.7
  • gnutls28 Ubuntu 24.04 LTS 3.8.3-1.1ubuntu3.4
  • gnutls28 Ubuntu 25.10 3.8.9-3ubuntu1
  • gnutls28 Ubuntu Pro FIPS-updates 22.04 LTS 3.7.3-4ubuntu1.7+Fips1
  • gnutls28 Ubuntu Pro FIPS-updates 24.04 LTS 3.8.3-1.1ubuntu3.4+Fips1

ubuntu advisories UBUNTU-CVE-2025-32989

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gnutls hummingbird 1 3.8.12-1.1.hum1
  • gnutls-c++ hummingbird 1 3.8.12-1.1.hum1
  • gnutls-dane hummingbird 1 3.8.12-1.1.hum1
  • gnutls-fips hummingbird 1 3.8.12-1.1.hum1
  • gnutls-utils hummingbird 1 3.8.12-1.1.hum1
  • mingw32-gnutls hummingbird 1 3.8.12-1.1.hum1
  • mingw64-gnutls hummingbird 1 3.8.12-1.1.hum1
  • gnutls RHEL 10.0 3.8.9-9.el10_0.14

red hat advisories RHSA-2026:7477RHSA-2025:17361RHSA-2025:17348RHSA-2025:16115RHSA-2025:16116

  • gnutls Linux Micro 6.1 3.8.3-slfo.1.1_4.1
  • gnutls Linux Micro 6.0 3.8.3-4.1
  • gnutls SLE Module for Basesystem 15 SP7, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 3.8.3-150600.4.9.1
  • gnutls SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +9 more 3.7.3-150400.4.50.1
  • gnutls SLE Micro 5.3 3.7.3-150400.14.1

suse advisories SUSE-SU-2025:20665-1SUSE-SU-2025:20563-1SUSE-SU-2025:02595-1SUSE-SU-2025:02589-1SUSE-SU-2025:02340-1

  • gnutls openSUSE Tumbleweed 3.8.10-1.1

opensuse advisories openSUSE-SU-2025:15411-1

  • gnutls AlmaLinux 10 3.8.9-9.el10_0.14
  • gnutls-c++ AlmaLinux 10 3.8.9-9.el10_0.14
  • gnutls-dane AlmaLinux 10 3.8.9-9.el10_0.14
  • gnutls-fips AlmaLinux 10 3.8.9-9.el10_0.14
  • gnutls-utils AlmaLinux 10 3.8.9-9.el10_0.14
  • gnutls AlmaLinux 9 3.8.3-6.el9_6.2
  • gnutls-c++ AlmaLinux 9 3.8.3-6.el9_6.2
  • gnutls-dane AlmaLinux 9 3.8.3-6.el9_6.2

almalinux advisories ALSA-2025:16115ALSA-2025:16116

  • gnutls Rocky Linux 9 3.8.3-6.el9_6.2
  • gnutls Rocky Linux 10 3.8.9-9.el10_0.14

rocky linux advisories RLSA-2025:16116RLSA-2025:16115

  • gnutls Alpine 3.22, Alpine 3.21, Alpine 3.20 3.8.12-r0
  • gnutls Alpine 3.24, Alpine 3.23 3.8.11-r0

alpine advisories ALPINE-CVE-2025-32989

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gnutls CBL-Mariner 2.0 3.7.11-4
  • gnutls Azure Linux 3.0 3.8.3-6

azure linux advisories AZL-65088AZL-65103

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-32989 updated cvss 5.3

gnutls: Vulnerability in GnuTLS SCT extension parsing

  • Red Hat Enterprise Linux 6 gnutls, gnutls-guile, gnutls-utils Red Hat Enterprise Linux 7 gnutls, gnutls-c++, gnutls-dane, gnutls-utils
    affected: workaround, no fix planned “Currently, no mitigation is available for this vulnerability.”
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Currently, no mitigation is available for this vulnerability.”
  • Red Hat Ceph Storage 7 rhceph
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:22529
  • Red Hat Discovery 2 discovery 2.3.0-1760554384
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:19088
  • Red Hat Enterprise Linux AppStream (v. 9) gnutls-c++ 3.8.3-6.el9_6.2, gnutls-dane 3.8.3-6.el9_6.2, gnutls-utils 3.8.3-6.el9_6.2
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:16116
  • Red Hat Enterprise Linux AppStream (v. 10) gnutls-c++ 3.8.9-9.el10_0.14, gnutls-dane 3.8.9-9.el10_0.14, gnutls-fips 3.8.9-9.el10_0.14, gnutls-utils 3.8.9-9.el10_0.14
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:16115
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) gnutls-c++ 3.7.6-21.el9_2.4, gnutls-dane 3.7.6-21.el9_2.4, gnutls-utils 3.7.6-21.el9_2.4
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:17361
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) gnutls-c++ 3.8.3-4.el9_4.4, gnutls-dane 3.8.3-4.el9_4.4, gnutls-utils 3.8.3-4.el9_4.4
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:17348
show 7 more
  • Red Hat Enterprise Linux BaseOS (v. 9) gnutls 3.8.3-6.el9_6.2
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:16116
  • Red Hat Enterprise Linux BaseOS (v. 10) gnutls 3.8.9-9.el10_0.14
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:16115
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) gnutls 3.7.6-21.el9_2.4
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:17361
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) gnutls 3.8.3-4.el9_4.4
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:17348
  • Red Hat Hardened Images gnutls 3.8.12-1.1.hum1, gnutls-c++ 3.8.12-1.1.hum1, gnutls-dane 3.8.12-1.1.hum1, gnutls-fips 3.8.12-1.1.hum1, gnutls-utils 3.8.12-1.1.hum1, mingw32-gnutls 3.8.12-1.1.hum1, +1 more
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2026:7477
  • Red Hat Insights proxy 1.5 insights-proxy 1.5.7-1759331989
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:17181
  • Red Hat Ceph Storage 7 rhceph Red Hat Discovery 2 discovery 2.3.0-1760553895 Red Hat Enterprise Linux 8 gnutls, gnutls-c++, gnutls-dane, gnutls-utils Red Hat Enterprise Linux AppStream EUS (v.9.4) gnutls-devel 3.8.3-4.el9_4.4
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-25-162-05 updated cvss 5.3

Siemens SIMATIC S7-1500 CPU family

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.5
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
15 mo ago

Exploit prediction

1.47% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
  • Red Hat Red Hat Ceph Storage 7
  • Red Hat Red Hat Discovery 2
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Insights proxy 1.5
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat OpenShift Container Platform 4
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.