CVE-2025-40778

High

Description

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.

SeverityHigh

CVSS8.6

Exploit probability—

ProductBIND 9

PublishedOct 22, 2025

First seenOct 22, 2025

Weakness typeCWE-349CWE-349

How to fix

Vendor advisories

kb.isc.org/docs/cve-2025-40778

Affected products

Product	Affected versions	Fixed in
ISC BIND 9	9.11.0 ≤ v ≤ 9.16.50, 9.18.0 ≤ v ≤ 9.18.39, 9.20.0 ≤ v ≤ 9.20.13, 9.21.0 ≤ v ≤ 9.21.12, 9.11.3-S1 ≤ v ≤ 9.16.50-S1, 9.18.11-S1 ≤ v ≤ 9.18.39-S1, 9.20.9-S1 ≤ v ≤ 9.20.13-S1	—

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