Vulnerabilities > CVE-2021-40083 - Reachable Assertion vulnerability in NIC Knot Resolver

CVSS 5.0 - MEDIUM

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

NONE

Confidentiality impact

NONE

Integrity impact

NONE

Availability impact

PARTIAL

network

low complexity

nic

CWE-617

NVD

Published: 2021-08-25

Updated: 2021-08-30

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).

Vulnerable Configurations

Part	Description	Count
Application	Nic NIC Knot Resolver 1.0.0 NIC Knot Resolver 1.1.0 NIC Knot Resolver 1.1.1 NIC Knot Resolver 1.2.0 NIC Knot Resolver 1.2.1 NIC Knot Resolver 1.2.2 NIC Knot Resolver 1.2.3 NIC Knot Resolver 1.2.4 NIC Knot Resolver 1.2.5 NIC Knot Resolver 1.2.6 NIC Knot Resolver 1.3.0 NIC Knot Resolver 1.3.1 NIC Knot Resolver 1.3.2 NIC Knot Resolver 1.3.3 NIC Knot Resolver 1.4.0 NIC Knot Resolver 1.5.0 NIC Knot Resolver 1.5.1 NIC Knot Resolver 1.5.2 NIC Knot Resolver 1.5.3 NIC Knot Resolver 1.99.1 NIC Knot Resolver 2.0.0 NIC Knot Resolver 2.1.0 NIC Knot Resolver 2.1.1 NIC Knot Resolver 2.2.0 NIC Knot Resolver 2.3.0 NIC Knot Resolver 2.4.0 NIC Knot Resolver 2.4.1 NIC Knot Resolver 3.0.0 NIC Knot Resolver 3.1.0 NIC Knot Resolver 3.2.0 NIC Knot Resolver 3.2.1 NIC Knot Resolver 4.0.0 NIC Knot Resolver 4.1.0 NIC Knot Resolver 4.2.0 NIC Knot Resolver 4.2.1 NIC Knot Resolver 4.2.2 NIC Knot Resolver 4.3.0 NIC Knot Resolver 5.0.0 NIC Knot Resolver 5.0.1 NIC Knot Resolver 5.1.1	47

Common Weakness Enumeration (CWE)

CWE-617 - Reachable Assertion

References

https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1169