VulnerabilityModified
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).
HIGH 7.5EPSS 1.42%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.42%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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).
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.42% probability · 71th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-617
- Affected
- nic/knot resolver
- Source
- cve@mitre.org
References
- https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1169Patch, Third Party Advisory
- https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1169Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.