CVE-2021-25219

MEDIUM

BIND 9.3.0-9.17.18 - Denial of Service via Lame Cache Exploitation

Title source: llm
STIX 2.1

Description

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.

References (10)

Core 10
Core References
Third Party Advisory vendor-advisory
https://www.debian.org/security/2021/dsa-4994
Mailing List, Third Party Advisory mailing-list
https://lists.debian.org/debian-lts-announce/2021/11/msg00001.html
Third Party Advisory vendor-advisory
https://security.gentoo.org/glsa/202210-25

Scores

CVSS v3 5.3
EPSS 0.0104
EPSS Percentile 77.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Details

Status published
Products (39)
debian/debian_linux 9.0
debian/debian_linux 10.0
debian/debian_linux 11.0
fedoraproject/fedora 33
fedoraproject/fedora 34
fedoraproject/fedora 35
isc/bind 9.9.3 s1
isc/bind 9.9.12 s1
isc/bind 9.9.13 s1
isc/bind 9.10.5 s1
... and 29 more
Published Oct 27, 2021
Tracked Since Feb 18, 2026