# CVE-2025-6395: Gnutls: null pointer dereference in _gnutls_figure_common_ciphersuite()

Status: published. Published: 2025-07-10. Updated: 2026-11-05.

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

## Remediation

- 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: redhat)

## Affected products and versions

-  /  (libgnutls): ≥ 0; < 3.8.10 (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (gnutls): ≥ 0:3.8.9-9.el10_0.14; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gnutls): ≥ 0:3.6.16-8.el8_10.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gnutls): ≥ 0:3.8.3-6.el9_6.2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (gnutls): ≥ 0:3.7.6-21.el9_2.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support (gnutls): ≥ 0:3.8.3-4.el9_4.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Ceph Storage 7 (rhceph/rhceph-7-rhel9): ≥ 7; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Discovery 2 (discovery/discovery-ui-rhel9): ≥ 2.3.0-1760554384; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Insights proxy 1.5 (insights-proxy/insights-proxy-container-rhel9): ≥ 1.5.7-1759331989; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (gnutls): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gnutls): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-8): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H; source: CNA: redhat

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.77% as of 2026-11-05; percentile 55.79%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-476

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2025:16115 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:16116 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:17181 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:17348 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:17361 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:17415 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:19088 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:22529 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2025-6395 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2376755 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.com/gnutls/gnutls/-/issues/1718 (CNA: redhat)

- https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html (CNA: redhat)

- https://lists.debian.org/debian-lts-announce/2025/08/msg00005.html (ADP: CVE)

- http://www.openwall.com/lists/oss-security/2025/07/11/3 (ADP: CVE)

- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (ADP: siemens-SADP)

- https://access.redhat.com/errata/RHSA-2025:16115 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:16116 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:17181 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:17348 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:17361 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:17415 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:19088 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:22529 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2025-6395 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2376755 (secalert@redhat.com)

- https://gitlab.com/gnutls/gnutls/-/issues/1718 (secalert@redhat.com)

- https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html (secalert@redhat.com)

- http://www.openwall.com/lists/oss-security/2025/07/11/3 (af854a3a-2127-422b-91ae-364da2661108)

- https://lists.debian.org/debian-lts-announce/2025/08/msg00005.html (af854a3a-2127-422b-91ae-364da2661108)

- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (0b142b55-0307-4c5a-b3c9-f314f3fb7c5e)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2025-6395; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-6395; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-6395; retrieved 2026-11-05; source updated Not reported

Revision: e4b3212f4871552e0413337c2f959892d8163248f19c078d1ff99c00a574da25

Canonical: https://y2.dev/cve/CVE-2025-6395

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