# CVE-2025-40780

## Summary

- **CVE ID:** CVE-2025-40780
- **Severity:** HIGH
- **CVSS Score:** 8.6 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N)
- **CWE:** CWE-341
- **Published:** Oct 22, 2025
- **Last Modified:** Mar 12, 2026

## 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.

## Affected Products

- ISC — BIND 9 (9.16.0)
- ISC — BIND 9 (9.18.0)
- ISC — BIND 9 (9.20.0)
- ISC — BIND 9 (9.21.0)
- ISC — BIND 9 (9.16.8-S1)
- ISC — BIND 9 (9.18.11-S1)
- ISC — BIND 9 (9.20.9-S1)

## References

- [CNA](https://kb.isc.org/docs/cve-2025-40780)
- [CVE](http://www.openwall.com/lists/oss-security/2025/10/22/1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.46%
- **EPSS Percentile:** 38.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._