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.
References (2)
Core 2
Core References
Various Sources vendor-advisory
https://kb.isc.org/docs/cve-2025-40780
Scores
CVSS v3
8.6
EPSS
0.0003
EPSS Percentile
7.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-341
Status
published
Products (7)
ISC/BIND 9
9.16.0 - 9.16.50
ISC/BIND 9
9.16.8-S1 - 9.16.50-S1
ISC/BIND 9
9.18.0 - 9.18.39
ISC/BIND 9
9.18.11-S1 - 9.18.39-S1
ISC/BIND 9
9.20.0 - 9.20.13
ISC/BIND 9
9.20.9-S1 - 9.20.13-S1
ISC/BIND 9
9.21.0 - 9.21.12
Published
Oct 22, 2025
Tracked Since
Feb 18, 2026