CVE-2021-25219 Affecting bind9 package, versions <1:9.16.22-1~deb11u1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.71% (82nd percentile)

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  • Snyk IDSNYK-DEBIAN11-BIND9-1767972
  • published28 Oct 2021
  • disclosed27 Oct 2021

Introduced: 27 Oct 2021

CVE-2021-25219  (opens in a new tab)

How to fix?

Upgrade Debian:11 bind9 to version 1:9.16.22-1~deb11u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream bind9 package and not the bind9 package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

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 authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.

CVSS Scores

version 3.1