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

Overview

Severity

Medium (CVSS 5.3)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2025-Feb

Released

2025-03-04

Last Updated

2026-08-12

EPSS Score

1.11% (percentile: 65.8%)

FAQ

Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability? One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.

Affected Products (8)

Mariner

• cbl2 gnutls 3.7.11-2 on CBL Mariner 2.0
• azl3 gnutls 3.8.3-3 on Azure Linux 3.0
• azl3 libtasn1 4.19.0-2 on Azure Linux 3.0
• azl3 gnutls 3.8.3-4 on Azure Linux 3.0

Open Source Software

• cbl2 libtasn1 4.19.0-2 on CBL Mariner 2.0
• cbl2 gnutls 3.7.11-3 on CBL Mariner 2.0
• cbl2 gnutls 3.7.11-3 on CBL-Mariner 2.0
• cbl2 libtasn1 4.19.0-2 on CBL-Mariner 2.0

Revision History

• 2025-03-04: Information published.
• 2025-03-14: Information published.
• 2025-04-12: Information published.
• 2026-02-19: Information published.
• 2026-08-12: Information published.