CVE-2025-40776

Public on 2025-07-16

Modified on 2025-07-21

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.

Severity

Important

See what this means

CVSS v3 Base Score

8.6

See breakdown

Affected Packages

Platform	Package	Status
Amazon Linux 1	bind	No Fix Planned
Amazon Linux 2 - Core	bind	Not Affected
Amazon Linux 2023	bind	Not Affected

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
NVD	CVSSv3	8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2025-40776 Mitre: CVE-2025-40776