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Security Advisory

USN-5021-1: curl vulnerabilities




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 18.04


Harry Sintonen and Tomas Hoger discovered that curl incorrectly handled TELNET connections when the -t option was used on the command line. Uninitialized data possibly containing sensitive information could be sent to the remote server, contrary to expectations. (CVE-2021-22898, CVE-2021-22925)

Harry Sintonen discovered that curl incorrectly reused connections in the connection pool. This could result in curl reusing the wrong connections. (CVE-2021-22924)

CVEs contained in this USN include: CVE-2021-22898, CVE-2021-22925, CVE-2021-22924.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • Bionic Stemcells
    • 1.x versions prior to 1.22
    • All other stemcells not listed.
  • cflinuxfs3
    • All versions prior to 0.250.0
  • CF Deployment
    • All versions prior to 16.22.0


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 1.22 or greater
    • All other stemcells should be upgraded to the latest version available on
  • cflinuxfs3
    • Upgrade all versions to 0.250.0 or greater
  • CF Deployment
    • Upgrade all versions to 16.22.0 or greater


2021-09-03: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR