CVE-2025-40775

DNS message with invalid TSIG causes an assertion failure

State: Published
Severity: 7.5 High
Published: May 21, 2025
Updated: May 23, 2025
Reserved: Apr 16, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	isc

Weaknesses

CWE-232 Improper Handling of Undefined Values

Affected Products

Product	Versions
BIND 9ISC	9.20.0 through 9.20.8Affected 9.21.0 through 9.21.7Affected

References

CVE-2025-40775vendor-advisory
http://www.openwall.com/lists/oss-security/2025/05/21/1
https://security.netapp.com/advisory/ntap-20250523-0001/

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