CVE-2021-25219

NameCVE-2021-25219
DescriptionIn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2807-1, DSA-4994-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
bind9 (PTS)stretch1:9.10.3.dfsg.P4-12.3+deb9u6vulnerable
stretch (security)1:9.10.3.dfsg.P4-12.3+deb9u10fixed
buster1:9.11.5.P4+dfsg-5.1+deb10u5vulnerable
buster (security)1:9.11.5.P4+dfsg-5.1+deb10u6fixed
bullseye1:9.16.15-1vulnerable
bullseye (security)1:9.16.22-1~deb11u1fixed
bookworm, sid1:9.17.20-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
bind9sourcestretch1:9.10.3.dfsg.P4-12.3+deb9u10DLA-2807-1
bind9sourcebuster1:9.11.5.P4+dfsg-5.1+deb10u6DSA-4994-1
bind9sourcebullseye1:9.16.22-1~deb11u1DSA-4994-1
bind9source(unstable)1:9.17.19-1

Notes

https://kb.isc.org/docs/cve-2021-25219
https://gitlab.isc.org/isc-projects/bind9/commit/8fe18c0566c41228a568157287f5a44f96d37662 (v9_16_22)
https://gitlab.isc.org/isc-projects/bind9/commit/e4931584a34bdd0a0d18e4d918fb853bf5296787 (v9_16_22)

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