Vulnerability · Published Feb 21, 2023 · Assigned by mitre
CVE-2023-26249
High 7.5
In plain English
A high-severity resource allocation without limits 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 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Knot Resolver before 5.6.0 enables attackers to consume its resources, launching amplification attacks and potentially causing a denial of service. Specifically, a single client query may lead to a hundred TCP connection attempts if a DNS server closes connections without providing a response.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | knot-resolver | 5.6.0-1 | DEBIAN-CVE-2023-26249 |
| Debian:13 | knot-resolver | 5.6.0-1 | DEBIAN-CVE-2023-26249 |
| Debian:14 | knot-resolver | 5.6.0-1 | DEBIAN-CVE-2023-26249 |
Affected products (as reported)
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H