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CVE-2025-40778

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Date: October 22, 2025

Under certain circumstances, BIND is too lenient when accepting records from answers, allowing an attacker to inject forged data into the cache. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.

Severity Score

Related Resources (3)

https://nvd.nist.gov/vuln/detail/CVE-2025-40778
https://kb.isc.org/docs/cve-2025-40778
https://www.mend.io/vulnerability-database/CVE-2025-40778

Severity Score

Weakness Type (CWE)

Acceptance of Extraneous Untrusted Data With Trusted Data

CWE-349

Top Fix

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Upgrade Version

Upgrade to version https://gitlab.isc.org/isc-projects/bind9.git - v9.18.41;https://gitlab.isc.org/isc-projects/bind9.git - v9.20.15;https://gitlab.isc.org/isc-projects/bind9.git - v9.21.14

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

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