CVE-2024-12133Network attack vector

Service interruption via quadratic DER sequence traversal

Published Feb 10, 2025 · Updated Jul 14, 2026

Inefficient DER decoding in GNU Libtasn1 before 4.20.0 allows remote attackers to interrupt services with a crafted certificate. Sequence elements are stored as a linked list, and decoding repeatedly searches backward for each parent node, producing quadratic processing time. Reachability requires an application that uses Libtasn1 to parse an attacker-supplied certificate with numerous alternative-name or name-constraint entries.

CVSS severity5.3
Medium
EPSS probability1.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Inefficient DER decoding in GNU Libtasn1 before 4.20.0 allows remote attackers to interrupt services with a crafted certificate. Sequence elements are stored as a linked list, and decoding repeatedly searches backward for each parent node, producing quadratic processing time. Reachability requires an application that uses Libtasn1 to parse an attacker-supplied certificate with numerous alternative-name or name-constraint entries.

The record

CVE
CVE-2024-12133
Published
Feb 10, 2025
Updated
Jul 14, 2026
Vendor
Siemens
Product
RUGGEDCOM ROX RX1500
Classifications
CWE-407, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <V2.17.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · RUGGEDCOM ROX RX1500version=0 <V2.17.0
Siemens · RUGGEDCOM ROX RX5000version=0 <V2.17.0
Siemens · RUGGEDCOM ROX RX1511version=0 <V2.17.0
Siemens · RUGGEDCOM ROX MX5000REversion=0 <V2.17.0
Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*
Siemens · RUGGEDCOM ROX RX1536version=0 <V2.17.0
389 Directory Server · Red Hat Discovery 1Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsAffected versions are unavailable in this record.
Siemens · RUGGEDCOM ROX RX1512version=0 <V2.17.0
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.5 <*
389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsAffected versions are unavailable in this record.
Siemens · RUGGEDCOM ROX RX1510version=0 <V2.17.0
389 Directory Server · Red Hat Enterprise Linux 9.4 Extended Update SupportAffected versions are unavailable in this record.
Siemens · RUGGEDCOM ROX RX1524version=0 <V2.17.0
389 Directory Server · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportAffected versions are unavailable in this record.
Siemens · RUGGEDCOM ROX RX1501version=0 <V2.17.0
389 Directory Server · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnAffected versions are unavailable in this record.
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceAffected versions are unavailable in this record.
Siemens · RUGGEDCOM ROX RX1400version=0 <V2.17.0
Siemens · RUGGEDCOM ROX MX5000version=0 <V2.17.0
389 Directory Server · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.
The GnuPG Project · GNU Libtasn1version=0 <4.20.0

Published CVSS scores

5.3SiemensCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-407Inefficient Algorithmic Complexity
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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