DEBIAN-CVE-2025-40775

DEBIAN-CVE-2025-40775 PUBLISHED CVSS 7.5 HIGH

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.

Risk Scores

CVSS 3.1

7.5

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

Affected Products

Vendor	Product	Versions
Debian:13	bind9	0, 0
Debian:14	bind9	0, 0

Exploit Intelligence

Demonstrates a real-world zero-trust bypass by exploiting BIND CVE-2025-40775 to disrupt DNS, break secret rotation, and expose static credentials in a cloud-native lab. (github-poc)

Timeline

May 21, 2025 CVE Published
Apr 28, 2026 CVE Updated

References

https://security-tracker.debian.org/tracker/CVE-2025-40775 advisory

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