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

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

Published: 2025-07-10 Last update: 2026-05-12 Assigner: [email protected] Source: [email protected]

Conclusion & alert: CVE-2025-6395 is rated Moderate Risk (42/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.62%). Mandatory action: Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-6395

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.27% 0.62% +0.35%
2 2026-05-06 0.05% 0.27% +0.22%
3 2026-03-15 0.05%

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-6395

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
2.2 4.2 [email protected]

Weakness enumeration for CVE-2025-6395

GitHub Security Advisory for CVE-2025-6395

GHSA-prf7-7jvx-hxj5 · Severity: medium — A NULL pointer dereference flaw was found in the GnuTLS software in...

OS Trackers for CVE-2025-6395

vendor priority summary link
alpine CVE-2025-6395: 1 source package rows (gnutls); 5 state rows across 5 repos (3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-main); fixed 5, open 0. https://security.alpinelinux.org/vuln/CVE-2025-6395
debian not yet assigned CVE-2025-6395 not yet assigned priority: Debian including 1 source packages (gnutls28), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-6395
gentoo high CVE-2025-6395: 1 GLSA(s) (202509-08), 1 atom(s) (net-libs/gnutls); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2025-6395
redhat medium https://access.redhat.com/security/cve/CVE-2025-6395
suse medium CVE-2025-6395 severity moderate: SUSE including 308 source package names (0.23.1-11.31:libgnutls30-3.8.3-150600.4.9.1, 0.3.2-1.2:libgnutls30-3.8.3-150600.4.9.1, …), 781 product×package rows across 306 product lines (Container bci/kiwi, Container bci/spack, … (306 product lines)): Fixed 535, Known Affected 226, Known Not Affected 20. https://www.suse.com/security/cve/CVE-2025-6395/
ubuntu medium CVE-2025-6395 medium priority: Ubuntu including 1 source packages (gnutls28), 9 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream, xenial): released 6, not-affected 2, ignored 1. https://ubuntu.com/security/CVE-2025-6395

Affected software / configurations for CVE-2025-6395

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2025-6395

URL Tags
https://access.redhat.com/errata/RHSA-2025:16115
https://access.redhat.com/errata/RHSA-2025:16116
https://access.redhat.com/errata/RHSA-2025:17181
https://access.redhat.com/errata/RHSA-2025:17348
https://access.redhat.com/errata/RHSA-2025:17361
https://access.redhat.com/errata/RHSA-2025:17415
https://access.redhat.com/errata/RHSA-2025:19088
https://access.redhat.com/errata/RHSA-2025:22529
https://access.redhat.com/security/cve/CVE-2025-6395
https://bugzilla.redhat.com/show_bug.cgi?id=2376755
https://gitlab.com/gnutls/gnutls/-/issues/1718
https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html
http://www.openwall.com/lists/oss-security/2025/07/11/3
https://lists.debian.org/debian-lts-announce/2025/08/msg00005.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
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