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CVE-2025-40780

Good to know:

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Date: October 22, 2025

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.

Severity Score

Related Resources (3)

https://kb.isc.org/docs/cve-2025-40780
https://nvd.nist.gov/vuln/detail/CVE-2025-40780
https://www.mend.io/vulnerability-database/CVE-2025-40780

Severity Score

Weakness Type (CWE)

Predictable from Observable State

CWE-341

Top Fix

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Upgrade Version

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

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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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