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CVE-2025-40775

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CVE-2025-40775

Published: May 21, 2025

Modified: May 23, 2025

PUBLISHED

CVSS v3.1

7.5

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.

VendorProductVersions

ISC

BIND 9

affected
9.20.0 - <= 9.20.8
affected
9.21.0 - <= 9.21.7

Weaknesses (CWE)

CWE-232

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

CVE-2025-40775
vendor-advisory

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