CVE-2024-0567Public exploitNetwork attack vector

Service crash via cyclic cross-signature chain

Published Jan 16, 2024 · Updated Nov 20, 2025

Certificate-chain verification in GnuTLS 3.8.0 through 3.8.2 allows remote attackers to crash dependent services via cyclic cross-signatures. The _gnutls_sort_clist function revisits an already sorted certificate when cross-signed certificate authorities form a loop, then reaches an assertion failure. Any network service that verifies an attacker-supplied chain with the affected library can terminate, interrupting that service without data disclosure or modification.

CVSS severity7.5
High
EPSS probability1.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Certificate-chain verification in GnuTLS 3.8.0 through 3.8.2 allows remote attackers to crash dependent services via cyclic cross-signatures. The _gnutls_sort_clist function revisits an already sorted certificate when cross-signed certificate authorities form a loop, then reaches an assertion failure. Any network service that verifies an attacker-supplied chain with the affected library can terminate, interrupting that service without data disclosure or modification.

The record

CVE
CVE-2024-0567
Published
Jan 16, 2024
Updated
Nov 20, 2025
Vendor
Red Hat
Product
Red Hat Enterprise Linux 9.2 Extended Update Support
Classifications
CWE-347, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Red Hat · Red Hat Enterprise Linux 9.2 Extended Update SupportAffected versions are unavailable in this record.
Red Hat · Red Hat Logging 5.8 for RHEL 9Affected versions are unavailable in this record.
Red Hat · Red Hat OpenShift Data Foundation 4.15 for RHEL 9Affected versions are unavailable in this record.
Red Hat · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
GnuTLS Project · GnuTLSversion=3.8.0 <3.8.3

Published CVSS scores

5.9SUSECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5Red Hat CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1499.004Application or System Exploitation

Public exploit references

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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