CVE-2023-4408: Fedoraproject Fedora

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

The DNS message parsing code in `named` includes a section whose computational complexity is overly high. It does not cause problems for typical DNS traffic, but crafted queries and responses may cause excessive CPU load on the affected `named` instance by exploiting this flaw. This issue affects both authoritative servers and recursive resolvers. This issue affects BIND 9 versions 9.0.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.

Affected products

• Fedoraproject Fedora: version 38 only; version 39 only
• ISC BIND: from 9.0.0, up to and including 9.16.45; from 9.18.0, up to and including 9.18.21; from 9.19.0, up to and including 9.19.19; version 9.9.3 only; version 9.16.8 only; version 9.16.11 only; …
• Netapp Ontap: version 9.14.1 only; version 9.15.1 only

Published 2024-02-13. Last modified 2026-06-17.