CVE-2021-25218: Fedoraproject Fedora

High severity, CVSS 7.5. EPSS: 3.6% chance of exploitation in the next 30 days.

In BIND 9.16.19, 9.17.16. Also, version 9.16.19-S1 of BIND Supported Preview Edition When a vulnerable version of named receives a query under the circumstances described above, the named process will terminate due to a failed assertion check. The vulnerability affects only BIND 9 releases 9.16.19, 9.17.16, and release 9.16.19-S1 of the BIND Supported Preview Edition.

Affected products

• Fedoraproject Fedora: version 34 only
• ISC BIND: version 9.16.19 only; version 9.17.16 only

Published 2021-08-18. Last modified 2026-06-17.