CVE-2025-40780

Cache poisoning due to weak PRNG

CVSS 8.6 HIGHEPSS 0.5%CWE-341

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Affected products

ISC · BIND 9

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References

https://kb.isc.org/docs/cve-2025-40780 http://www.openwall.com/lists/oss-security/2025/10/22/1