CVE-2024-12243 (CVSS 5.3)

Description

A flaw was found in GnuTLS, which relies on libtasn1 for ASN.1 data processing. Due to an inefficient algorithm in libtasn1, decoding certain DER-encoded certificate data can take excessive time, leading to increased resource consumption. This flaw allows a remote attacker to send a specially crafted certificate, causing GnuTLS to become unresponsive or slow, resulting in a denial-of-service condition.

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CVSS v3.1 Score

5.3

MEDIUM

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

Weakness Type (CWE)

CWE-407 CWE-407

References

Other References

https://access.redhat.com/errata/RHSA-2025:17361 https://access.redhat.com/errata/RHSA-2025:4051 https://access.redhat.com/errata/RHSA-2025:7076 https://access.redhat.com/errata/RHSA-2025:8020 https://access.redhat.com/errata/RHSA-2025:8385 https://access.redhat.com/security/cve/CVE-2024-12243 https://bugzilla.redhat.com/show_bug.cgi?id=2344615 https://gitlab.com/gnutls/gnutls/-/issues/1553 https://gitlab.com/gnutls/libtasn1/-/issues/52 https://lists.debian.org/debian-lts-announce/2025/02/msg00027.html

Frequently Asked Questions

What is CVE-2024-12243? +

A flaw was found in GnuTLS, which relies on libtasn1 for ASN.1 data processing. Due to an inefficient algorithm in libtasn1, decoding certain DER-encoded certificate data can take excessive time, leading to increased resource consumption. This flaw allows a remote attacker to send a specially crafted certificate, causing GnuTLS to become unresponsive or slow, resulting in a denial-of-service condition. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2024-12243? +

CVE-2024-12243 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2024-12243? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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