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.
References
History

Tue, 22 Jul 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
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.
Title Birthday Attack against Resolvers supporting ECS
Weaknesses CWE-349
References
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: isc

Published: 2025-07-16T13:41:01.337Z

Updated: 2025-07-22T14:55:04.420Z

Reserved: 2025-04-16T08:44:49.856Z

Link: CVE-2025-40776

cve-icon Vulnrichment

Updated: 2025-07-22T14:55:00.920Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-07-16T14:15:25.053

Modified: 2025-07-16T14:58:59.837

Link: CVE-2025-40776

cve-icon Redhat

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