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CVE Record

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

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.

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-12133 is a denial-of-service flaw in libtasn1 certificate parsing. A crafted certificate with many elements can make parsing take far longer than expected, potentially slowing or crashing affected systems. It does not indicate data theft or code execution in the provided sources.

Executive priority

Handle in the normal security update cycle, with faster action for exposed certificate-processing services. Business impact is availability degradation, not confirmed compromise. The main risk is avoidable outage from malformed certificate input on affected systems.

Technical view

The issue is inefficient DER decoding in libtasn1, mapped to CWE-407. CVSS 3.1 is 5.3: network reachable, low complexity, no privileges, no user interaction, unchanged scope, availability impact only. Red Hat lists affected libtasn1 and some gnutls packages across RHEL streams and Red Hat Discovery.

Likely exposure

Exposure is most likely on systems or applications that use libtasn1, directly or through gnutls, to process untrusted certificates. The source bundle specifically identifies multiple Red Hat Enterprise Linux 8 and 9 streams, lifecycle add-ons, SAP/TUS variants, and Red Hat Discovery 1.14.

Exploitation context

The provided evidence supports remote denial of service through specially crafted certificate data. CISA KEV status is false in the bundle, and no cited source here confirms active exploitation. Treat this as a service-availability risk, especially for certificate-processing paths exposed to untrusted networks.

Researcher notes

Evidence is strongest for algorithmic complexity in DER certificate decoding. The affected list includes duplicated Red Hat entries and package-level detail; normalize by product stream, package, and installed version. Do not assume exploit-in-the-wild status from the provided bundle.

Mitigation direction

  • Apply vendor security updates from relevant Red Hat advisories where applicable.
  • Update affected libtasn1 and gnutls packages through supported package channels.
  • Check non-Red Hat platforms against their own vendor advisories.
  • Prioritize internet-facing or partner-facing certificate-processing services.
  • Avoid unsupported package pinning that leaves affected versions installed.

Validation and detection

  • Inventory installed libtasn1 and gnutls package versions across Linux hosts.
  • Compare versions and products against Red Hat CVE and RHSA entries.
  • Identify services that parse client-supplied or externally supplied certificates.
  • Review monitoring for CPU, latency, or crash spikes during certificate handling.
  • Regression-test TLS and certificate workflows after updating packages.
Prepared
Confidence
high
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-407: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2024-12133 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
5Timeline events
3ADP providers
17Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L3.91.4redhat

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2024-12133Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. Source timelineredhat

    Made public.

  3. Source timelineredhat

    Reported to Red Hat.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Unknown vendorlibtasn1libtasn1, 0unaffected
Red HatRed Hat Enterprise Linux 8libtasn1, 0:4.13-5.el8_10affected
Red HatRed Hat Enterprise Linux 8libtasn1, 0:4.13-5.el8_10affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportgnutls, 0:3.6.14-10.el8_4.1affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportlibtasn1, 0:4.13-3.el8_4.1affected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Ongnutls, 0:3.6.14-10.el8_4.1affected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onlibtasn1, 0:4.13-3.el8_4.1affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportgnutls, 0:3.6.16-5.el8_6.5affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportlibtasn1, 0:4.13-3.el8_6.2affected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Ongnutls, 0:3.6.16-5.el8_6.5affected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onlibtasn1, 0:4.13-3.el8_6.2affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Servicegnutls, 0:3.6.16-7.el8_8.4affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Servicelibtasn1, 0:4.13-4.el8_8.1affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutionsgnutls, 0:3.6.16-7.el8_8.4affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutionslibtasn1, 0:4.13-4.el8_8.1affected
Red HatRed Hat Enterprise Linux 9libtasn1, 0:4.16.0-9.el9affected
Red HatRed Hat Enterprise Linux 9libtasn1, 0:4.16.0-9.el9affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutionslibtasn1, 0:4.16.0-8.el9_2.1affected
Red HatRed Hat Enterprise Linux 9.4 Extended Update Supportlibtasn1, 0:4.16.0-8.el9_4.1affected
Red HatRed Hat Discovery 1.14discovery/discovery-server-rhel9, 1.14.3-1748529279affected
Red HatRed Hat Discovery 1.14discovery/discovery-ui-rhel9, 1.14.2-1748467619affected
Red HatRed Hat Enterprise Linux 10libtasn1affected
Red HatRed Hat Enterprise Linux 6libtasn1unknown
Red HatRed Hat Enterprise Linux 7libtasn1unknown
Red HatRed Hat OpenShift Container Platform 4rhcosaffected
Weakness

CWE details

CWE-407

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.