CVE-2025-14831 | Gnutls: gnutls: denial of service via excessive resource consumption during certificate verification

A flaw was found in GnuTLS. This vulnerability allows a denial of service (DoS) by excessive CPU (Central Processing Unit) and memory consumption via specially crafted malicious certificates containing a large number of name constraints and subject alternative names (SANs).

Published: 2026-02-09 Last update: 2026-05-14 Assigner: [email protected] Source: [email protected]

Conclusion & alert: CVE-2025-14831 is rated Low Risk (28.4/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.07%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2025-14831

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 2026-03-24 0.05% 0.07% +0.02%
2 2026-03-21 0.06% 0.05% -0.02%
3 2026-03-17 0.06%

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-14831

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 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:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
3.9 1.4 [email protected]

Weakness enumeration for CVE-2025-14831

GitHub Security Advisory for CVE-2025-14831

GHSA-pm8w-jq9r-x5rp · Severity: medium — A flaw was found in GnuTLS. This vulnerability allows a denial of service (DoS) by excessive CPU ...

OS Trackers for CVE-2025-14831

vendor priority summary link
alpine CVE-2025-14831: 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-2025-14831
debian not yet assigned CVE-2025-14831 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-2025-14831
redhat medium https://access.redhat.com/security/cve/CVE-2025-14831
suse medium https://www.suse.com/security/cve/CVE-2025-14831/
ubuntu medium CVE-2025-14831 medium priority: Ubuntu including 1 source packages (gnutls28), 7 status rows across 7 suites (bionic, focal, jammy, noble, questing, upstream, xenial): released 4, needs-triage 3. https://ubuntu.com/security/CVE-2025-14831

Affected software / configurations for CVE-2025-14831

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2025-14831

URL Tags
https://access.redhat.com/errata/RHSA-2026:13812
https://access.redhat.com/errata/RHSA-2026:16008
https://access.redhat.com/errata/RHSA-2026:16009
https://access.redhat.com/errata/RHSA-2026:16174
https://access.redhat.com/errata/RHSA-2026:3477
https://access.redhat.com/errata/RHSA-2026:4188
https://access.redhat.com/errata/RHSA-2026:4655
https://access.redhat.com/errata/RHSA-2026:4943
https://access.redhat.com/errata/RHSA-2026:5585
https://access.redhat.com/errata/RHSA-2026:5606
https://access.redhat.com/errata/RHSA-2026:6618
https://access.redhat.com/errata/RHSA-2026:6630
https://access.redhat.com/errata/RHSA-2026:6737
https://access.redhat.com/errata/RHSA-2026:6738
https://access.redhat.com/errata/RHSA-2026:7329
https://access.redhat.com/errata/RHSA-2026:7335
https://access.redhat.com/errata/RHSA-2026:7477
https://access.redhat.com/errata/RHSA-2026:8746
https://access.redhat.com/errata/RHSA-2026:8747
https://access.redhat.com/errata/RHSA-2026:8748
https://access.redhat.com/security/cve/CVE-2025-14831
https://bugzilla.redhat.com/show_bug.cgi?id=2423177
https://gitlab.com/gnutls/gnutls/-/issues/1773
https://cert-portal.siemens.com/productcert/html/ssa-032379.html
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