Gnutls: stack-based buffer overflow in gnutls_pkcs11_token_init() function

4 CVSS

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2025-9820

Check My Exposure

Credits & Attribution

No credits recorded in the NVD database.

References

More from Red Hat

View All →

CVE-2025-9909

Aap-gateway: improper path validation in gateway allows credential exfiltration

Medium 6.7

CVE-2025-9908

Event-driven-ansible: sensitive internal headers disclosure in aap eda event streams

Medium 6.7

CVE-2025-9907

Event-driven-ansible: event stream test mode exposes sensitive headers in aap eda

Medium 6.7

CVE-2025-9901

Libsoup: improper handling of http vary header in libsoup caching

Medium 5.9

CVE-2025-9615

Networkmanager: networkmanager file access

Low 3.3

Affected Vendor

Red Hat

View all reports →

Affected Software

Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, RHEL-8 based Middleware Containers, Red Hat Ceph Storage 8, Red Hat Discovery 2, Red Hat Hardened Images, Red Hat Insights proxy 1.5, Red Hat Update Infrastructure 5, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat OpenShift Container Platform 4

Vulnerable Versions:

0:3.8.10-3.el10_1, 0:3.6.16-8.el8_10.5, 0:3.8.3-10.el9_7, 7.13.5-4.1777325677, 7.13.5-4.1777325711, 7.13.5-4.1777325710, 7.13.5-3.1777325680, 7.13.5-4.1777325709, 7.13.5-4.1777325680, 7.13.5-4.1777325708, 1774002867, 1775668717, 1775675922, 3.8.12-1.1.hum1, 1773685509, 1773670073, 1773672059, 1773668803, 1773670137