CVE Alert: CVE-2025-40777
Vulnerability Summary: CVE-2025-40777
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.
Affected Endpoints:
No affected endpoints listed.
Published Date:
7/16/2025, 6:15:24 PM
🔥 CVSS Score:
Exploit Status:
Not ExploitedReferences:
Recommended Action:
No proposed action available. Please refer to vendor documentation for updates.
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