CVE-2025-40775 HIGH

CVE-2025-40775: DNS message with invalid TSIG causes an assertion failure

Vendor Isc
Product BIND 9
Weakness CWE-232
Published May 21, 2025
Last update May 23, 2025
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 21, 2025 CVE published
May 23, 2025 Record updated