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Security Advisory

USN-4305-1: ICU vulnerability

USN-4305-1: ICU vulnerability




Canonical Ubuntu

Versions Affected

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


André Bargull discovered that ICU incorrectly handled certain strings. An attacker could possibly use this issue to execute arbitrary code.

CVEs contained in this USN include: CVE-2020-10531.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs3
    • All versions prior to 0.171.0
  • Xenial Stemcells
    • 97.x versions prior to 97.239
    • 170.x versions prior to 170.210
    • 250.x versions prior to 250.189
    • 315.x versions prior to 315.175
    • 456.x versions prior to 456.104
    • 621.x versions prior to 621.64
    • All other stemcells not listed.
  • CF Deployment
    • All versions prior to v12.37.0


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 0.171.0 or greater
  • Xenial Stemcells
    • Upgrade 97.x versions to 97.239 or greater
    • Upgrade 170.x versions to 170.210 or greater
    • Upgrade 250.x versions to 250.189 or greater
    • Upgrade 315.x versions to 315.175 or greater
    • Upgrade 456.x versions to 456.104 or greater
    • Upgrade 621.x versions to 621.64 or greater
    • All other stemcells should be upgraded to the latest version available on
  • CF Deployment
    • Upgrade All versions to v12.37.0 or greater


2020-03-17: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR