Bug 2380930 (CVE-2025-40776) - CVE-2025-40776 bind: Birthday Attack against Resolvers supporting ECS
Summary: CVE-2025-40776 bind: Birthday Attack against Resolvers supporting ECS
Keywords:
Status: NEW
Alias: CVE-2025-40776
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-07-16 14:01 UTC by OSIDB Bzimport
Modified: 2026-06-08 17:48 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2025-07-16 14:01:52 UTC 
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.
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