CVE-2024-0553: Fedoraproject Fedora

High severity, CVSS 7.5. EPSS: 1.6% chance of exploitation in the next 30 days.

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: version 39 only
• GNU Gnutls: before 3.8.3 (fixed in 3.8.3)
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only

Published 2024-01-16. Last modified 2026-06-17.