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CVE-2023-40044

Critical CVSS 10 Known exploited

Published 2023-09-27 · last changed 2026-06-17 · added to CISA KEV 2023-10-05

This one is being exploited in the wild.

CISA added CVE-2023-40044 to the Known Exploited Vulnerabilities catalog on 2023-10-05. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2023-40044, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

In WS_FTP Server versions prior to 8.7.4 and 8.8.2, a pre-authenticated attacker could leverage a .NET deserialization vulnerability in the Ad Hoc Transfer module to execute remote commands on the underlying WS_FTP Server operating system.

Sources

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