CyberRota Analysis
This is a high severity vulnerability with a CVSS score of 7.5. See the original NVD description below for full technical details.
CVE
CVE-2025-40777
Severity
HIGH
CVSS
7.5
EPSS
0.88%
Original NVD Description
If a `named` caching resolver is configured with `serve-stale-enable` `yes`, and with `stale-answer-client-timeout` set to `0` (the only allowable value other than `disabled`), and if the resolver, in the process of resolving a query, encounters a CNAME chain involving a specific combination of cached or authoritative records, the daemon will abort with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.10, 9.21.0 through 9.21.9, and 9.20.9-S1 through 9.20.10-S1.