Public vulnerability disclosure
CVE-2025-6395
Gnutls: null pointer dereference in _gnutls_figure_common_ciphersuite()
publishedCWE-476
A NULL pointer dereference flaw was found in the GnuTLS software in _gnutls_figure_common_ciphersuite().
Technical severity6.5 mediumCVSS 3.1 · CNA: redhat
Published2025-07-10Source updated 2026-11-05
Collected2026-11-053 attributed sources
Fixes and workarounds
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Source: CNA: redhatAffected products and versions
| Product | Versions | Authority |
|---|---|---|
libgnutls
https://www.gnutls.org/ |
≥ 0; < 3.8.10 (affected, semver)
Other versions: unaffected |
CNA: redhat |
| Red Hat Enterprise Linux 10 Red Hat gnutls
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:3.8.9-9.el10_0.14; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8 Red Hat gnutls
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:3.6.16-8.el8_10.4; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9 Red Hat gnutls
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:3.8.3-6.el9_6.2; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat gnutls
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:3.7.6-21.el9_2.4; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.4 Extended Update Support Red Hat gnutls
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:3.8.3-4.el9_4.4; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Ceph Storage 7 Red Hat rhceph/rhceph-7-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 7; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Discovery 2 Red Hat discovery/discovery-ui-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 2.3.0-1760554384; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Insights proxy 1.5 Red Hat insights-proxy/insights-proxy-container-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1.5.7-1759331989; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 6 Red Hat gnutls
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unknown |
CNA: redhat |
| Red Hat Enterprise Linux 7 Red Hat gnutls
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unknown |
CNA: redhat |
| Red Hat OpenShift Container Platform 4 Red Hat openshift/ose-rhel-coreos-8
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4 Red Hat openshift/ose-rhel-coreos-9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.5; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Siemens |
≥ V3.1.5; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.5; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.5 medium |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H | CNA: redhat |
| 3.1 / 6.5 medium |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://access.redhat.com/errata/RHSA-2025:16115CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:16116CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:17181CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:17348CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:17361CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:17415CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:19088CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:22529CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2025-6395CNA: redhat · vdb-entry, x_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2376755CNA: redhat · issue-tracking, x_refsource_REDHAT
- https://gitlab.com/gnutls/gnutls/-/issues/1718CNA: redhat
- https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.htmlCNA: redhat
- https://lists.debian.org/debian-lts-announce/2025/08/msg00005.htmlADP: CVE
- http://www.openwall.com/lists/oss-security/2025/07/11/3ADP: CVE
- https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlADP: siemens-SADP
- https://access.redhat.com/errata/RHSA-2025:16115[email protected]
- https://access.redhat.com/errata/RHSA-2025:16116[email protected]
- https://access.redhat.com/errata/RHSA-2025:17181[email protected]
- https://access.redhat.com/errata/RHSA-2025:17348[email protected]
- https://access.redhat.com/errata/RHSA-2025:17361[email protected]
- https://access.redhat.com/errata/RHSA-2025:17415[email protected]
- https://access.redhat.com/errata/RHSA-2025:19088[email protected]
- https://access.redhat.com/errata/RHSA-2025:22529[email protected]
- https://access.redhat.com/security/cve/CVE-2025-6395[email protected]
- https://bugzilla.redhat.com/show_bug.cgi?id=2376755[email protected]
- https://gitlab.com/gnutls/gnutls/-/issues/1718[email protected]
- https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html[email protected]
- http://www.openwall.com/lists/oss-security/2025/07/11/3af854a3a-2127-422b-91ae-364da2661108
- https://lists.debian.org/debian-lts-announce/2025/08/msg00005.htmlaf854a3a-2127-422b-91ae-364da2661108
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
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