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Security Advisory

USN-4754-1: Python vulnerabilities




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 14.04
  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04


It was discovered that Python incorrectly handled certain inputs. An attacker could possibly use this issue to execute arbitrary code or cause a denial of service. (CVE-2020-27619, CVE-2021-3177)

CVEs contained in this USN include: CVE-2021-3177, CVE-2020-27619.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs3
    • All versions prior to 0.226.0
  • Xenial Stemcells
    • 456.x versions prior to 456.145
    • 621.x versions prior to 621.108
    • All other stemcells not listed.
  • CF Deployment
    • All versions prior to 16.5.0


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

  • cflinuxfs3
    • Upgrade All versions to 0.226.0 or greater
  • Xenial Stemcells
    • Upgrade 456.x versions to 456.145 or greater
    • Upgrade 621.x versions to 621.108 or greater
    • All other stemcells should be upgraded to the latest version available onĀ
  • CF Deployment
    • Upgrade All versions to 16.5.0 or greater


2021-03-02: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR