CVE-2024-0567: A vulnerability was found in GnuTLS, where a cockpit (which uses gnuTLS) rejects a certificate chain with dist

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HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2024-0567 is a high-severity flaw (CVSS 7.5) affecting gnutls, fedora, active iq unified manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in GnuTLS, where a cockpit (which uses gnuTLS) rejects a certificate chain with distributed trust. This issue occurs when validating a certificate chain with cockpit-certificate-ensure. This flaw allows an unauthenticated, remote client or attacker to initiate a denial of service attack.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-347
Published	2024-01-16
Last modified	2026-11-05

Publisher (CNA): Red Hat, Inc. · Vendor: debian · fedoraproject · gnu · netapp

Last updated 2026-11-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-01-16 14:15 UTCPublished CVE record published
2026-11-05 12:17 UTCUpdated Record last modified

gnu gnutls UPGRADE

Affected: >= 3.7.0 and < 3.8.3

Fixed in: 3.8.3

Safe to downgrade to: a release before 3.7.0

1. Check installed version

apt-cache policy gnutls || rpm -q gnutls || gnutls --version

2. UPGRADE to 3.8.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gnutls

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gnutls

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.7.0 (Debian / Ubuntu)

apt-cache madison gnutls sudo apt install gnutls=<VERSION_BEFORE_3.7.0> sudo apt-mark hold gnutls

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list gnutls sudo dnf downgrade gnutls-<VERSION_BEFORE_3.7.0> sudo dnf versionlock add gnutls

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

fedoraproject fedora MITIGATE

Affected: 38 · 39

Fixed in: no fixed release known

Safe to downgrade to: a release before 38

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

netapp active iq unified manager MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy active-iq-unified-manager || rpm -q active-iq-unified-manager || active-iq-unified-manager --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

debian debian linux MITIGATE

Affected: 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-0567?

gnutls: upgrade to 3.8.3; fedora: mitigate or apply the listed mitigation; active iq unified manager: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-0567 being exploited?

CVE-2024-0567 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-0567 affect?

CVE-2024-0567 affects gnutls, fedora, active iq unified manager. Severity is high (CVSS 7.5). A vulnerability was found in GnuTLS, where a cockpit (which uses gnuTLS) rejects a certificate chain with distributed trust. This issue occurs when validating a certificate chain with cockpit-certificate-ensure. This flaw allows an unauthen

How urgent is CVE-2024-0567?

Priority 59/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities · GnuTLS vulnerabilities

Related CVEs

CVE-2026-3833 MEDIUM 6.5 MITIGATE MITIGATE A flaw was found in gnutls
CVE-2025-32990 MEDIUM 6.5 MITIGATE DOWNGRADE A heap-buffer-overflow (off-by-one) flaw was found in the GnuTLS software in the template parsing logic within
CVE-2025-32989 MEDIUM 5.3 MITIGATE DOWNGRADE A heap-buffer-overread vulnerability was found in GnuTLS in how it handles the Certificate Transparency (CT) S
CVE-2025-32988 MEDIUM 6.5 UPGRADE DOWNGRADE A flaw was found in GnuTLS
CVE-2024-0553 HIGH 7.5 UPGRADE MITIGATE A vulnerability was found in GnuTLS

References

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