UBUNTU-CVE-2021-40083

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Source
https://ubuntu.com/security/CVE-2021-40083
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-40083.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-40083
Upstream
Withdrawn
2025-07-18T16:46:59Z
Published
2021-08-25T01:15:00Z
Modified
2025-07-16T07:43:13.770156Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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).

References

Affected packages

Ubuntu:22.04:LTS / knot-resolver

Package

Name
knot-resolver
Purl
pkg:deb/ubuntu/knot-resolver@5.4.4-1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.4.4-1

Affected versions

5.*

5.3.1-1
5.4.2-1
5.4.3-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "5.4.4-1",
            "binary_name": "knot-resolver"
        },
        {
            "binary_version": "5.4.4-1",
            "binary_name": "knot-resolver-dbgsym"
        },
        {
            "binary_version": "5.4.4-1",
            "binary_name": "knot-resolver-doc"
        },
        {
            "binary_version": "5.4.4-1",
            "binary_name": "knot-resolver-module-http"
        }
    ],
    "availability": "No subscription required"
}