Is CVE-2025-40780 actively exploited?

No active exploitation of CVE-2025-40780 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-40780 be exploited remotely?

Yes. CVE-2025-40780 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-40780?

CVE-2025-40780 has a CVSS score of 8.6 (HIGH).

HOME VULNERABILITIESCVE-2025-40780

HIGH

CVE-2025-40780

CWE-341Published: October 22, 2025· Updated: Jun 17, 2026

8.6

CVSS v3.1

Official Description

In specific circumstances, due to a weakness in the Pseudo Random Number Generator (PRNG) that is used, it is possible for an attacker to predict the source port and query ID that BIND will use.

This issue affects BIND 9 versions 9.16.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.16.8-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.

NVD Source

Technical Analysis

CVE-2025-40780 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 full integrity compromise (data manipulation), with a CVSS base score of 8.6.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.