CVE-2025-40780

Cache poisoning due to weak PRNG

State: Published
Severity: 8.6 High
Published: Oct 22, 2025
Updated: Nov 4, 2025
Reserved: Apr 16, 2025

Description

In specific circumstances, due to a weakness in the Pseudo Random Number Generator (PRNG) that is used, it is possible for an attacker to predict the source port and query ID that BIND will use. This issue affects BIND 9 versions 9.16.0 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, 9.16.8-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.

Scores

CVSS	Score	Vector	Source
3.1	8.6 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N	isc

Weaknesses

CWE-341 Predictable from Observable State

Affected Products

Product	Versions
BIND 9ISC	9.16.0 through 9.16.50Affected 9.18.0 through 9.18.39Affected 9.20.0 through 9.20.13Affected 9.21.0 through 9.21.12Affected 9.16.8-S1 through 9.16.50-S1Affected 9.18.11-S1 through 9.18.39-S1Affected 9.20.9-S1 through 9.20.13-S1Affected

References

CVE-2025-40780vendor-advisory
http://www.openwall.com/lists/oss-security/2025/10/22/1

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