GnuTLS fixes a medium-severity vulnerability

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[TLP:CLEAR] GnuTLS fixes a medium-severity vulnerability

GnuTLS version 3.8.9 fixes one medium-severity vulnerability [1][2]. Among operating systems, a fix has been provided, for example, by Debian in the sid release in version 3.8.9-2 [3] and by Slackware with the release of gnutls-3.8.9 as part of SSA:2025-039-01 [4]. Libtasn1 has been updated to the latest version 4.20.0 [4].

GnuTLS - denial of service (CVE-2024-12243)

CVSS 5.3 (Medium)

Allows an unauthenticated remote attacker to slow down or make GnuTLS unavailable by sending a specially crafted certificate, due to an inefficient algorithm in libtasn1 when decoding certain DER certificates [1][2].

The vulnerability is present in product:

*:GnuTLS; <3.8.9

CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

More information:

CVE-2024-12243 at cve.org, NVD
CWE-407: Inefficient Algorithmic Complexity at cwe.mitre.org

The vulnerability was publicly disclosed 10. 2. 2025.

Links

By CESNET, z.s.p.o. Michaela Jarošová on 12. 2. 2025.

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[TLP:CLEAR] GnuTLS fixes a medium-severity vulnerability

GnuTLS - denial of service (CVE-2024-12243)

CVSS 5.3 (Medium)

Links