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Fencer Vulns
medium 6.5

CVE-2025-6395 json

Gnutls: null pointer dereference in _gnutls_figure_common_ciphersuite()

published 2025-07-10 16 mo ago modified 2026-11-05 4 d ago also EUVD-2025-21000

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

A NULL pointer dereference flaw was found in the GnuTLS software in _gnutls_figure_common_ciphersuite().

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:3.8.9-9.el10_0.14
  • Red Hat Red Hat Enterprise Linux 8 0:3.6.16-8.el8_10.4
  • 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 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-2025-6395

  • 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 20.04 LTS 3.6.13-2ubuntu1.12+esm1
  • 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-2025-6395

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 RHEL 8 3.6.16-8.el8_10.4
  • gnutls-c++ RHEL 8 3.6.16-8.el8_10.4
  • gnutls-dane RHEL 8 3.6.16-8.el8_10.4
  • gnutls-utils RHEL 8 3.6.16-8.el8_10.4
  • gnutls RHEL 10.0 3.8.9-9.el10_0.14
  • gnutls-c++ RHEL 10.0 3.8.9-9.el10_0.14
  • gnutls-dane RHEL 10.0 3.8.9-9.el10_0.14
  • gnutls-fips RHEL 10.0 3.8.9-9.el10_0.14

red hat advisories RHSA-2025:17415RHSA-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 SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +3 more 3.6.7-150200.14.37.1
  • 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-2025:02583-1SUSE-SU-2025:02340-1

  • gnutls openSUSE Tumbleweed 3.8.10-1.1

opensuse advisories openSUSE-SU-2025:15411-1

  • gnutls AlmaLinux 8 3.6.16-8.el8_10.4
  • gnutls-c++ AlmaLinux 8 3.6.16-8.el8_10.4
  • gnutls-dane AlmaLinux 8 3.6.16-8.el8_10.4
  • gnutls-utils AlmaLinux 8 3.6.16-8.el8_10.4
  • 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

almalinux advisories ALSA-2025:17415ALSA-2025:16115ALSA-2025:16116

  • gnutls Rocky Linux 9 3.8.3-6.el9_6.2
  • gnutls Rocky Linux 8 3.6.16-8.el8_10.4
  • gnutls Rocky Linux 10 3.8.9-9.el10_0.14

rocky linux advisories RLSA-2025:16116RLSA-2025:17415RLSA-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-2025-6395

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-65154AZL-65193

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-2025-6395 updated cvss 6.5

gnutls: NULL pointer dereference in _gnutls_figure_common_ciphersuite()

  • 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 “Out of support scope”
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Ceph Storage 7 rhceph
    fixed: vendor fix RHSA-2025:22529
  • Red Hat Discovery 2 discovery 2.3.0-1760554384
    fixed: vendor fix RHSA-2025:19088
  • Red Hat Enterprise Linux AppStream (v. 8) gnutls-c++ 3.6.16-8.el8_10.4, gnutls-dane 3.6.16-8.el8_10.4, gnutls-utils 3.6.16-8.el8_10.4
    fixed: vendor fix RHSA-2025:17415
  • 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 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 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 RHSA-2025:17361
show 8 more
  • 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 RHSA-2025:17348
  • Red Hat Enterprise Linux BaseOS (v. 8) gnutls 3.6.16-8.el8_10.4
    fixed: vendor fix RHSA-2025:17415
  • Red Hat Enterprise Linux BaseOS (v. 9) gnutls 3.8.3-6.el9_6.2
    fixed: vendor fix RHSA-2025:16116
  • Red Hat Enterprise Linux BaseOS (v. 10) gnutls 3.8.9-9.el10_0.14
    fixed: vendor fix RHSA-2025:16115
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) gnutls 3.7.6-21.el9_2.4
    fixed: vendor fix RHSA-2025:17361
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) gnutls 3.8.3-4.el9_4.4
    fixed: vendor fix RHSA-2025:17348
  • Red Hat Insights proxy 1.5 insights-proxy 1.5.7-1759331989
    fixed: vendor fix RHSA-2025:17181
  • Red Hat Ceph Storage 7 rhceph Red Hat Discovery 2 discovery 2.3.0-1760553895 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 6.5

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
16 mo ago

Exploit prediction

0.77% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • 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 Insights proxy 1.5
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • 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

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.