CVE-2021-25220

Description

BIND 9.11.0 -> 9.11.36 9.12.0 -> 9.16.26 9.17.0 -> 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 -> 9.11.36-S1 9.16.8-S1 -> 9.16.26-S1 Versions of BIND 9 earlier than those shown - back to 9.1.0, including Supported Preview Editions - are also believed to be affected but have not been tested as they are EOL. The cache could become poisoned with incorrect records leading to queries being made to the wrong servers, which might also result in false information being returned to clients.

How to fix CVE-2021-25220

To remediate CVE-2021-25220, upgrade the affected package to a fixed version below.

• —upgrade to 9.16.27-r0 or later
• —upgrade to 1:9.16.27-1~deb11u1 or later
• —upgrade to 1:9.10.3.dfsg.P4-12.3+deb9u11 or later
• —upgrade to 1:9.11.5.P4+dfsg-5.1+deb10u7 or later

Is CVE-2021-25220 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (4)

• from 0, < 9.16.27-r0
• from 0, < 1:9.16.27-1~deb11u1
• from 0, < 1:9.10.3.dfsg.P4-12.3+deb9u11
• from 0, < 1:9.11.5.P4+dfsg-5.1+deb10u7

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2021-25220
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-25220