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CVE-2025-40776

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CVE-2025-40776

Published: Jul 16, 2025

Modified: Jul 22, 2025

PUBLISHED

CVSS v3.1

8.6

HIGH

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.

VendorProductVersions

ISC

BIND 9

affected
9.11.3-S1 - <= 9.16.50-S1
affected
9.18.11-S1 - <= 9.18.37-S1
affected
9.20.9-S1 - <= 9.20.10-S1
unaffected
9.0.0 - <= 9.20.10

Weaknesses (CWE)

CWE-349

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

High

Availability

None

References

CVE-2025-40776
vendor-advisory

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