CVE-2025-40775
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductBIND 9
PublishedMay 21, 2025
First seenMay 21, 2025
Weakness typeCWE-232CWE-232
How to fix
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ISC BIND 9 | 9.20.0 ≤ v ≤ 9.20.8, 9.21.0 ≤ v ≤ 9.21.7 | — |
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