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Security Advisory

USN-5051-3: OpenSSL vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 18.04


USN-5051-1 fixed a vulnerability in OpenSSL. This update provides the corresponding update for the openssl1.0 package in Ubuntu 18.04 LTS.

Original advisory details:

Ingo Schwarze discovered that OpenSSL incorrectly handled certain ASN.1 strings. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service, or possibly obtain sensitive information. (CVE-2021-3712)

CVEs contained in this USN include: CVE-2021-3712.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • Bionic Stemcells
    • 1.x versions prior to 1.28
    • All other stemcells not listed.
  • cflinuxfs3
    • All versions prior to 0.254.0
  • CF Deployment
    • All versions prior to 16.23.0


Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:

  • Bionic Stemcells
    • Upgrade 1.x versions to 1.28 or greater
    • All other stemcells should be upgraded to the latest version available on
  • cflinuxfs3
    • Upgrade all versions to 0.254.0 or greater
  • CF Deployment
    • Upgrade all versions to 16.23.0 or greater


2021-10-28: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR