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.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.6
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
- EPSS probability
- 0.21%
- CWE
- CWE-349
- Published
- 2025-07-16
- Last modified
- 2026-03-12
Affected products
- ISC BIND 9
- ISC BIND 9
- ISC BIND 9
- ISC BIND 9
Weakness type
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