CVE-2025-40775
7.5
HIGH
CVSS 3.1
EPSS 0.18%
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.
How to fix CVE-2025-40775
To remediate CVE-2025-40775, upgrade the affected package to a fixed version below.
- Alpine/bind—upgrade to 9.18.37-r0 or later
- —upgrade to 1:9.20.9-1 or later
Is CVE-2025-40775 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 9.18.37-r0
- from 0, < 1:9.20.9-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |