VULNERABILITY INTELLIGENCE

CVE-2023-0361

CVSS score7.4 HIGH
EPSS probability1.45%
CISA KEVNot currently listed
Published2023-02-15
Last modified2026-10-14
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Description

A timing side-channel in the handling of RSA ClientKeyExchange messages was discovered in GnuTLS. This side-channel can be sufficient to recover the key encrypted in the RSA ciphertext across a network in a Bleichenbacher style attack. To achieve a successful decryption the attacker would need to send a large amount of specially crafted messages to the vulnerable server. By recovering the secret from the ClientKeyExchange message, the attacker would be able to decrypt the application data exchanged over that connection.

Weakness classification

  • CWE-203: Observable Discrepancy

Primary references