CVE-2025-40775
high
CVSS v3
—
CVSS v2
—
VIR risk
8.0
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.
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2025-40775.html
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2025-40775
Vendor advisory: arch — https://security.archlinux.org/ASA-202505-14
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 0 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 1:9.20.9-1 |
| debian | sid | fixed | 1:9.20.9-1 |
| debian | trixie | fixed | 1:9.20.9-1 |
| arch | fixed | 9.20.9-1 | |
| sles | affected | |
References
Verify integrity in audit chain (admin only). AS-IS.