CVE-2025-40776 Information

Jul 17, 2025 cve

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.

CVSS Vector

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

Reference

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

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

8.6

CNNVD-202507-2228 (Published: 2025-07-16)

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