What is CVE-2021-40083?

CVE-2021-40083 is a high-severity vulnerability in Nic Knot_resolver, classified under Reachable Assertion. CVSS score: 7.5/10. Published 2021-08-25.

How severe is CVE-2021-40083?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-40083 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Nic Knot_resolver

CVE-2021-40083

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).

EPSS: 0.014 (69.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Nic Knot_resolver
N/a — versions n/a

Weakness classification (CWE)

CWE-617 — Reachable Assertion

Public proof-of-concept exploits

Farrhouq/Inpt-report

References

cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-40083?: CVE-2021-40083 is a high-severity vulnerability in Nic Knot_resolver, classified under Reachable Assertion. CVSS score: 7.5/10. Published 2021-08-25.
How severe is CVE-2021-40083?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-40083 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.