CVE-2025-40776

8.6 highEPSS 0.2%

High (8.6). EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.6 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 13% of CVEs (scores of 2026-10-31)
CWE: CWE-349
Published: 2025-07-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

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

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