CVE-2024-0553: Gnutls: incomplete fix for cve-2023-5981

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-01-16 · updated 2026-10-15
Weakness: CWE-203

Description

A vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from the response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.

Affected products

Fedoraproject Fedora: 39
[UNKNOWN] gnutls: before 3.8.3 — fixed in 3.8.3
Red Hat Enterprise Linux: 8.0, 9.0

How to fix

Upgrade to a fixed version: [UNKNOWN] gnutls 3.8.3. Check the vendor advisory for mitigations.

References

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