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CVE-2025-40777

Good to know:

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Date: July 16, 2025

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.

Severity Score

Related Resources (3)

https://nvd.nist.gov/vuln/detail/CVE-2025-40777
https://kb.isc.org/docs/cve-2025-40777
https://www.mend.io/vulnerability-database/CVE-2025-40777

Severity Score

Weakness Type (CWE)

Reachable Assertion

CWE-617

Top Fix

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Upgrade Version

Upgrade to version https://github.com/isc-projects/bind9.git - v9.20.11;https://github.com/isc-projects/bind9.git - v9.21.10

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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