Birthday Attack against Resolvers supporting ECS_CVE-2025-40776

8.6 / 10

HIGH

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

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.

Basic Information

ID CVE-2025-40776

Source isc

Published Jul 16, 2025 at 13:41

Modified Jul 22, 2025 at 14:55

Affected Product

Vendor ISC

Product BIND 9

Version 9.11.3-S1

Affected Versions ISC BIND 9 9.11.3-S1
ISC BIND 9 9.18.11-S1
ISC BIND 9 9.20.9-S1

CWE Classification

CWE-349

References

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

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    "published": "2025-07-16T13:41:01.337Z",
    "modified": "2025-07-22T14:55:04.420Z",
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