CVE-2025-40776

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.

Score

CVSS 3.1 8.6 High

Status

Deferred - security-officer@isc.org

Published

2025-07-16

Last modified

2025-07-22

Weaknesses

CWE-349

Affected products

• Bind 9 (Isc)

References

• https://kb.isc.org/docs/cve-2025-40776