SecuriTricks - CVE-2025-40776

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.

Product(s) Impacted

Vendor	Product	Versions
Isc	Bind	9.11.3-9.16.50-S1, 9.18.11-9.18.37-S1, 9.20.9-9.20.10-S1

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-349

Acceptance of Extraneous Untrusted Data With Trusted Data

The product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	isc	bind	9.11.3-9.16.50-S1	/	/	/	/	/	/	/
a	isc	bind	9.18.11-9.18.37-S1	/	/	/	/	/	/	/
a	isc	bind	9.20.9-9.20.10-S1	/	/	/	/	/	/	/

References

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

CVSS Score

8.6 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: NONE
Scope: CHANGED
Confidentiality Impact: NONE
Integrity Impact: HIGH
Availability Impact: NONE

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

View Vector String

Timeline

Published: July 16, 2025, 2:15 p.m.
Last Modified: July 16, 2025, 2:58 p.m.

Status : Awaiting Analysis

CVE has been marked for Analysis. Normally once in this state the CVE will be analyzed by NVD staff within 24 hours.

More info

Source

security-officer@isc.org

CVE-2025-40776