# CVE-2024-12243: Gnutls: gnutls impacted by inefficient der decoding in libtasn1 leading to remote dos

Status: published. Published: 2025-02-10. Updated: 2026-11-05.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

-  /  (gnutls): ≥ 0; ≤ 3.6.16 (affected, semver); ≥ 3.7.0; ≤ 3.7.11 (affected, semver); ≥ 3.8.0; < 3.8.8 (affected, semver); ≥ 3.8.9; < * (unaffected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gnutls): ≥ 0:3.6.16-8.el8_10.3; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gnutls): ≥ 0:3.8.3-6.el9; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (gnutls): ≥ 0:3.7.6-21.el9_2.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support (gnutls): ≥ 0:3.8.3-4.el9_4.2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Discovery 1.14 (discovery/discovery-server-rhel9): ≥ 1.14.3-1748529279; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Discovery 1.14 (discovery/discovery-ui-rhel9): ≥ 1.14.2-1748467619; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (gnutls): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (gnutls): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gnutls): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / RUGGEDCOM ROX MX5000: ≥ 0; < V2.17.0 (affected, custom). Source: ADP: siemens-SADP
- Siemens / RUGGEDCOM ROX MX5000RE: ≥ 0; < V2.17.0 (affected, custom). Source: ADP: siemens-SADP
- Siemens / RUGGEDCOM ROX RX1400: ≥ 0; < V2.17.0 (affected, custom). Source: ADP: siemens-SADP
- Siemens / RUGGEDCOM ROX RX1500: ≥ 0; < V2.17.0 (affected, custom). Source: ADP: siemens-SADP
- Siemens / RUGGEDCOM ROX RX1501: ≥ 0; < V2.17.0 (affected, custom). Source: ADP: siemens-SADP
- Siemens / RUGGEDCOM ROX RX1510: ≥ 0; < V2.17.0 (affected, custom). Source: ADP: siemens-SADP
- Siemens / RUGGEDCOM ROX RX1511: ≥ 0; < V2.17.0 (affected, custom). Source: ADP: siemens-SADP
- Siemens / RUGGEDCOM ROX RX1512: ≥ 0; < V2.17.0 (affected, custom). Source: ADP: siemens-SADP
- Siemens / RUGGEDCOM ROX RX1524: ≥ 0; < V2.17.0 (affected, custom). Source: ADP: siemens-SADP
- Siemens / RUGGEDCOM ROX RX1536: ≥ 0; < V2.17.0 (affected, custom). Source: ADP: siemens-SADP
- Siemens / RUGGEDCOM ROX RX5000: ≥ 0; < V2.17.0 (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 1.29% as of 2026-11-04; percentile 70.35%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-407

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2025:17361 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:4051 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:7076 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:8020 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:8385 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2024-12243 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2344615 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.com/gnutls/gnutls/-/issues/1553 (CNA: redhat)

- https://gitlab.com/gnutls/libtasn1/-/issues/52 (CNA: redhat)

- https://lists.debian.org/debian-lts-announce/2025/02/msg00027.html (ADP: CVE)

- https://security.netapp.com/advisory/ntap-20250523-0002/ (ADP: CVE)

- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-202008.html (ADP: siemens-SADP)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2024-12243; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2024-12243; retrieved 2026-11-05; source updated Not reported

Revision: e7e88f5b8300c6a78ff6be021efe0bdc1f4e7a3ac784207dc9b197c25f9a018b

Canonical: https://y2.dev/cve/CVE-2024-12243

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