CVE-2025-40776
8.6
HIGH
CVSS 3.1
EPSS 0.05%
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.
How to fix CVE-2025-40776
To remediate CVE-2025-40776, upgrade the affected package to a fixed version below.
- Alpine/bind—upgrade to 9.20.11-r0 or later
Is CVE-2025-40776 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 9.20.11-r0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N |