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CVE-2025-40776 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CNA: [email protected]CVSS-B:8.6 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://kb.isc.org/docs/cve-2025-40776	[email protected]	AdvisoryRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-349	Acceptance of Extraneous Untrusted Data With Trusted Data	[email protected]

Affected Products

Product	Versions
ISC BIND 9	>= 9.11.3-S1, <= 9.16.50-S1 (semver) >= 9.18.11-S1, <= 9.18.37-S1 (semver) >= 9.20.9-S1, <= 9.20.10-S1 (semver)
CPE cpe:2.3:a:isc:bind::::::supported_preview::* Remediation Upgrade: 9.18.38-S1moderate effort Upgrade: 9.20.11-S1moderate effort Workaround:low effort Disable ECS by removing the "ecs-zones" option from "named.conf".

Change History

3 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Jul 16, 2025	New CVE Received	[email protected]