Vulnerability · Published Aug 25, 2021 · Assigned by mitre
CVE-2021-40083
High 7.5
In plain English
A high-severity security flaw in the knot-resolver package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 73% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.4%top 27.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | knot-resolver | 5.4.1-2 | DEBIAN-CVE-2021-40083 |
| Debian:13 | knot-resolver | 5.4.1-2 | DEBIAN-CVE-2021-40083 |
| Debian:14 | knot-resolver | 5.4.1-2 | DEBIAN-CVE-2021-40083 |
| Ubuntu:22.04:LTS | knot-resolver | 5.4.4-1 | UBUNTU-CVE-2021-40083 |
Affected products (as reported)
References
- https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1169 x_refsource_MISC