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.

INFO

Published Date :

2025-07-16T17:38:06.370Z

Last Modified :

2025-07-18T14:25:48.883Z

Source :

isc
AFFECTED PRODUCTS

The following products are affected by CVE-2025-40777 vulnerability.

No data.

REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-40777.

URL Resource
https://kb.isc.org/docs/cve-2025-40777 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-40777 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-40777 cve-icon
Login to claim this CVE

CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact