Is CVE-2025-40775 actively exploited?

No active exploitation of CVE-2025-40775 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-40775 be exploited remotely?

Yes. CVE-2025-40775 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-40775?

CVE-2025-40775 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2025-40775

HIGH

CVE-2025-40775

CWE-232Published: May 21, 2025· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2025-40775 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.