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OpenAdvisories
Medium USN-5126-1 1 CVE

bind9 vulnerability

Published Oct 28, 2021 · Updated Apr 22, 2026

Ecosystem: Ubuntu

Summary

Kishore Kumar Kothapalli discovered that Bind incorrectly handled the lame
cache when processing responses. A remote attacker could possibly use this
issue to cause Bind to consume resources, resulting in a denial of service.

Fixed packages 2

ReleasePackageFixed in
Ubuntu · 18.04 LTS 18.04:LTS bind9 1:9.11.3+dfsg-1ubuntu1.16
Ubuntu · 20.04 LTS 20.04:LTS bind9 1:9.16.1-0ubuntu2.9

Vulnerabilities 1

  • Medium 5.3
    CVE-2021-25219 EPSS 11%

    Lame cache can be abused to severely degrade resolver performance

    In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 -> 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND 9.17 development branch, exploitation of broken authorita…

    ISC BIND9 bind9 bind9 Debian Ubuntu Azure Linux Alpine

References

  • report
    https://ubuntu.com/security/CVE-2021-25219