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Vulnerability details: VCID-ne61-utfg-8bgx
Vulnerability ID VCID-ne61-utfg-8bgx
Aliases CVE-2021-40083
Summary 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).
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk None
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
epss 0.0084 https://api.first.org/data/v1/epss?cve=CVE-2021-40083
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-40083
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40083
991463 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991463
No exploits are available.
There are no known vectors.
Exploit Prediction Scoring System (EPSS)
Percentile 0.74656
EPSS Score 0.0084
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T16:35:02.843520+00:00 Debian Oval Importer Import https://www.debian.org/security/oval/oval-definitions-bullseye.xml.bz2 38.0.0