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Security Advisory

USN-4754-2: Python regression


Canonical Ubuntu

Versions Affected

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


USN-4754-1 fixed a vulnerability in Python. The fix for CVE-2021-3177 introduced a regression in Python 2.7. This update reverts the security fix pending further investigation.

We apologize for the inconvenience.

Original advisory details:

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)

Affected Cloud Foundry Products and Versions

  • cflinuxfs3
    • All versions prior to 0.226.0
  • 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
  • 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