# CVE-2024-12133: Libtasn1: inefficient der decoding in libtasn1 leading to potential remote dos

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

A flaw in libtasn1 causes inefficient handling of specific certificate data. When processing a large number of elements in a certificate, libtasn1 takes much longer than expected, which can slow down or even crash the system. This flaw allows an attacker to send a specially crafted certificate, causing a denial of service attack.

## Remediation

No remediation reported in collected sources

## Affected products and versions

-  /  (libtasn1): ≥ 0; < 4.20.0 (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (libtasn1): ≥ 0:4.13-5.el8_10; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (gnutls): ≥ 0:3.6.14-10.el8_4.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (libtasn1): ≥ 0:4.13-3.el8_4.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (gnutls): ≥ 0:3.6.14-10.el8_4.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (libtasn1): ≥ 0:4.13-3.el8_4.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (gnutls): ≥ 0:3.6.16-5.el8_6.5; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (libtasn1): ≥ 0:4.13-3.el8_6.2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (gnutls): ≥ 0:3.6.16-5.el8_6.5; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (libtasn1): ≥ 0:4.13-3.el8_6.2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service (gnutls): ≥ 0:3.6.16-7.el8_8.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service (libtasn1): ≥ 0:4.13-4.el8_8.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (gnutls): ≥ 0:3.6.16-7.el8_8.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (libtasn1): ≥ 0:4.13-4.el8_8.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (libtasn1): ≥ 0:4.16.0-9.el9; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (libtasn1): ≥ 0:4.16.0-8.el9_2.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support (libtasn1): ≥ 0:4.16.0-8.el9_4.1; < * (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 (libtasn1): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (libtasn1): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (libtasn1): 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: 1.11% as of 2026-11-04; percentile 66.02%

- 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-2025:17347 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:4049 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:7077 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:8021 (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/errata/RHSA-2026:30849 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:30850 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:33125 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2024-12133 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2344611 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.com/gnutls/libtasn1/-/blob/master/doc/security/CVE-2024-12133.md (CNA: redhat)

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

- http://www.openwall.com/lists/oss-security/2025/02/06/6 (ADP: CVE)

- https://lists.debian.org/debian-lts-announce/2025/02/msg00025.html (ADP: CVE)

- https://security.netapp.com/advisory/ntap-20250523-0003/ (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-2024-12133; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2024-12133; retrieved 2026-11-05; source updated Not reported

Revision: f69b2f83a69cdc4764d43652f1692ea006147d0284e682ab9b9058400d238f71

Canonical: https://y2.dev/cve/CVE-2024-12133

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