CVE-2021-40083

HIGH

Knot Resolver < 5.3.2 - Denial of Service via NSEC3 Iteration Assertion Failure

Title source: llm
STIX 2.1

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).

References (1)

Core 1
Core References
Patch, Third Party Advisory x_refsource_misc
https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1169

Scores

CVSS v3 7.5
EPSS 0.0138
EPSS Percentile 68.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-617
Status published
Products (1)
nic/knot_resolver < 5.3.2
Published Aug 25, 2021
Tracked Since Feb 18, 2026