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Security Advisory

USN-6499-1: GnuTLS vulnerability

USN-6499-1: GnuTLS vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 22.04


It was discovered that GnuTLS had a timing side-channel when handling certain RSA-PSK key exchanges. A remote attacker could possibly use this issue to recover sensitive information. Update Instructions: Run `sudo pro fix USN-6499-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: libgnutls30 – 3.6.13-2ubuntu1.9 libgnutls28-dev – 3.6.13-2ubuntu1.9 libgnutlsxx28 – 3.6.13-2ubuntu1.9 gnutls-doc – 3.6.13-2ubuntu1.9 libgnutls-dane0 – 3.6.13-2ubuntu1.9 gnutls-bin – 3.6.13-2ubuntu1.9 guile-gnutls – 3.6.13-2ubuntu1.9 libgnutls-openssl27 – 3.6.13-2ubuntu1.9 No subscription required

CVEs contained in this USN include: CVE-2023-5981.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs4
    • All versions prior to 1.52.0
  • Jammy Stemcells
    • 1.x versions prior to 1.309
    • All other stemcells not listed.
  • CF Deployment
    • All versions with Jammy Stemcells prior to 1.309


Users of affected products are strongly encouraged to follow the mitigations below.

The Cloud Foundry project recommends upgrading the following releases:

  • cflinuxfs4
    • Upgrade all versions to 1.52.0 or greater
  • Jammy Stemcells
    • Upgrade 1.x versions to 1.309 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • For all versions, upgrade Jammy Stemcells to 1.309 or greater


2024-03-18: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR