CVE-2021-40083
HIGH
7.5
CVSS Score
Published: August 25, 2021 at 12:21 AM UTC
Updated: June 17, 2026 at 04:06 AM UTC
1 product affected across 1 vendorKnot Resolver
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Severity
HIGH7.5
Exploit prediction
EPSS 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).
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 5.3.2
Affected range stops below 5.3.2, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1169CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-617
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