Vulnerability DatabaseCVE-2025-40780
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CVE-2025-40780
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.
Affected Packages
https://gitlab.isc.org/isc-projects/bind9.git (SCM_GIT):
Affected version(s) >=v9.18.0 <v9.18.41
Fix Suggestion:
Update to version v9.18.41
https://gitlab.isc.org/isc-projects/bind9.git (SCM_GIT):
Affected version(s) >=v9.21.0 <v9.21.14
Fix Suggestion:
Update to version v9.21.14
https://gitlab.isc.org/isc-projects/bind9.git (SCM_GIT):
Affected version(s) >=v9.20.0 <v9.20.15
Fix Suggestion:
Update to version v9.20.15
Related Resources (2)
https://kb.isc.org/docs/cve-2025-40780
http://www.openwall.com/lists/oss-security/2025/10/22/1
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CVSS v4
Base Score:
9.2
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
HIGH
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.6
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Predictable from Observable State
CWE-341
EPSS
Base Score:
0.02