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CVE-2025-40777

A possible assertion failure when 'stale-answer-client-timeout' is set to '0' PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
ISC / BIND 9affected 9.20.0 through 9.20.10; affected 9.21.0 through 9.21.9; affected 9.20.9-S1 through 9.20.10-S1; unaffected 9.18.0 through 9.18.37; unaffected 9.18.11-S1 through 9.18.37-S1

CWE

CWE-617

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

CVE

No English description supplied.