GHSA-337w-h8w7-m899 · Severity: medium — A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function...
A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.
Conclusion & alert: CVE-2025-9820 is rated Low Risk (16.2/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.01%). Mandatory action: Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
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 | 2026-01-27 | — | 0.01% | — |
Full EPSS history (1 record total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 4.0 | 3.1 | MEDIUM |
|
2.5 | 1.4 | [email protected] |
GHSA-337w-h8w7-m899 · Severity: medium — A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function...
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2025-9820: 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-2025-9820 |
debian
|
not yet assigned | CVE-2025-9820 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-2025-9820 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2025-9820 |
suse
|
medium | CVE-2025-9820 severity moderate: SUSE including 301 source package names (0.23.1-11.90:libgnutls30-3.8.3-150600.4.12.1, 0.6.36-13.5:libgnutls30-3.8.3-150600.4.12.1, …), 631 product×package rows across 260 product lines (Container bci/spack, Container containers/open-webui, … (260 product lines)): Fixed 394, Known Affected 231, First Fixed 5, Known Not Affected 1. | https://www.suse.com/security/cve/CVE-2025-9820/ |
ubuntu
|
low | CVE-2025-9820 low priority: Ubuntu including 1 source packages (gnutls28), 8 status rows across 8 suites (bionic, focal, jammy, noble, plucky, questing, upstream, xenial): released 4, needs-triage 3, ignored 1. | https://ubuntu.com/security/CVE-2025-9820 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| No affected products in dataset. | |||