ZeroDay Findings
Sign inSign up

Findings

CVE-2023-0361

A timing side-channel in the handling of RSA ClientKeyExchange messages was discovered in GnuTLS.

Published Feb 15, 2023 · updated Oct 14, 2026 · gnu gnutls

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.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 15, 2023 · NIST NVD

    Detected

    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 f

  2. Oct 14, 2026 · NIST NVD

    Updated

    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 f

Affected

  • cpe debian/debian linux10.0
  • cpe fedoraproject/fedora36
  • cpe fedoraproject/fedora37
  • cpe fedoraproject/fedora38
  • cpe gnu/gnutls3.6.8-11.el8_2
  • cpe netapp/active iq unified managerversion unspecified
  • cpe redhat/enterprise linux8.0
  • cpe redhat/enterprise linux9.0

Sources

  • CVE.orgVulnerability recordCVE-2023-0361

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-0361

    30-day exploitation probability 1.5%

    first.org
  • NIST NVDVulnerability recordCVE-2023-0361

    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 attac

    nvd.nist.gov

References