# CVE-2025-40775

## Summary

- **CVE ID:** CVE-2025-40775
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-232
- **Published:** May 21, 2025
- **Last Modified:** Mar 12, 2026

## Description

When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it.  If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure.
This issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7.

## Affected Products

- ISC — BIND 9 (9.20.0)
- ISC — BIND 9 (9.21.0)

## References

- [CNA](https://kb.isc.org/docs/cve-2025-40775)
- [CVE](http://www.openwall.com/lists/oss-security/2025/05/21/1)
- [CVE](https://security.netapp.com/advisory/ntap-20250523-0001/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 15.22%
- **EPSS Percentile:** 96.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._