| Name | CVE-2021-40083 |
| Description | Knot Resolver before 5.3.2 is prone to an assertion failure, triggerable by a remote attacker in an edge case (NSEC3 with too many iterations used for a positive wildcard proof). |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 991463 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| knot-resolver (PTS) | buster (security), buster, buster (lts) | 3.2.1-3+deb10u2 | fixed |
| bullseye | 5.3.1-1+deb11u1 | fixed |
| bookworm (security), bookworm | 5.6.0-1+deb12u1 | fixed |
| sid, trixie | 5.7.4-2 | fixed |
The information below is based on the following data on fixed versions.
Notes
[buster] - knot-resolver <not-affected> (Vulnerable code introduced later)
https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1169
Introduced by https://gitlab.nic.cz/knot/knot-resolver/-/commit/7107faebc72c14c864622128a20a9b39fe94d733 (5.3.1)