High severity8.6NVD Advisory· Published Jul 16, 2025· Updated Apr 15, 2026

CVE-2025-40776

Description

A named caching resolver that is configured to send ECS (EDNS Client Subnet) options may be vulnerable to a cache-poisoning attack. This issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1.

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

kb.isc.org/docs/cve-2025-40776nvd

News mentions

No linked articles in our index yet.

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