UBUNTU-CVE-2025-9820

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    UBUNTU-CVE-2025-9820

    Published: 26 Jan 2026Last Modified: 6 Jul 2026
    Upstream:
    CVE-2025-9820

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2025-9820, https://www.cve.org/CVERecord?id=CVE-2025-9820, https://www.gnutls.org/security-new.html#GNUTLS-SA-2025-11-18, https://ubuntu.com/security/notices/USN-8043-1, https://ubuntu.com/security/notices/USN-8502-1

    Affected packages

    Package

    Name: gnutls28

    Purl: pkg:deb/ubuntu/gnutls28?arch=source&distro=esm-infra-legacy%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.4.10-4ubuntu1.9+esm3

    Affected versions

    3.3.15-5ubuntu2
    3.3.18-1ubuntu1
    3.3.20-1ubuntu1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2025-9820 | CVE-DB