Security readout for executives and security teams
Plain-English summary
CVE-2024-12243 is a denial-of-service issue in GnuTLS through its libtasn1 certificate parsing. An attacker can send a specially crafted certificate that makes parsing take excessive CPU time, slowing or hanging affected services. The issue affects availability, not data theft or privilege escalation based on the supplied sources.
Executive priority
Treat as a scheduled but visible remediation item. It is remotely reachable and unauthenticated, but the documented impact is denial of service with low availability severity. Prioritize exposed Linux services and vendor appliances before internal-only workloads.
Technical view
GnuTLS relies on libtasn1 for ASN.1 DER decoding. An inefficient decoding algorithm can consume excessive processing time on crafted certificate data. The CVSS 3.1 vector is network-accessible, low complexity, unauthenticated, no user interaction, unchanged scope, and low availability impact. It is classified as CWE-407.
Likely exposure
Exposure is most likely in systems and products using affected GnuTLS/libtasn1 packages to process untrusted certificates. The bundle identifies affected Red Hat Enterprise Linux 8, 9, 10, OpenShift Container Platform 4 rhcos, and Red Hat Discovery 1.14 entries, with additional public advisories from Debian LTS and other vendors.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The attack path is remote and unauthenticated, but impact is limited to service slowdown or unresponsiveness. Practical risk depends on whether exposed services accept or validate attacker-supplied certificates.
Researcher notes
The affected component boundary is GnuTLS behavior driven by libtasn1 DER parsing. The bundle lacks detailed fixed-version mapping for every downstream product, so validation should rely on vendor advisories rather than inferred version ranges. Do not assume compromise or code execution from these sources.
Mitigation direction
- Apply relevant Red Hat security advisories where applicable.
- Check Debian LTS, GnuTLS, libtasn1, and product vendor guidance for fixed packages.
- Prioritize internet-facing certificate-processing services first.
- Monitor affected services for abnormal CPU use or TLS handshake latency.
- Use standard rate limiting or connection controls where operationally appropriate.
Validation and detection
- Inventory systems and containers using GnuTLS or libtasn1.
- Compare installed package versions against vendor advisories and affected package lists.
- Identify services that process client-supplied or remote certificates.
- Confirm patched package versions through approved asset management data.
- Review vulnerability scanner findings for duplicate RHEL package entries.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-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 lookupContainer 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 lookupCVE-2024-12243 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- 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
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.
SSVC decision data
CVSS vector scores
1 official scoreWe 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L3.91.4redhatVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Source timelineredhat
Made public.
- Source timelineredhat
Reported to Red Hat.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2025:17361CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2025:4051CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2025:7076CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2025:8020CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2025:8385CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2024-12243CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2344615CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://gitlab.com/gnutls/gnutls/-/issues/1553CVE reference, redhat
- https://gitlab.com/gnutls/libtasn1/-/issues/52CVE reference, redhat
- https://lists.debian.org/debian-lts-announce/2025/02/msg00027.htmlCVE reference, CVE
- https://security.netapp.com/advisory/ntap-20250523-0002/CVE reference, CVE
- https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlCVE reference, siemens-SADP
- https://cert-portal.siemens.com/productcert/html/ssa-202008.htmlCVE reference, siemens-SADP
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Inefficient Algorithmic Complexity
Inefficient Algorithmic Complexity represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.