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7.5

Progress WS_FTP Server can be stopped via crafted SSH key

CVE-2026-90869 · published 6 days ago
Summary

If someone obtains a legitimate SSH key for your WS_FTP Server, they can send a specially formed request that shuts down the SSH service, interrupting file transfers. This affects WS_FTP Server versions before the 2024.0.7 and 2025.0.4 releases on Windows. Upgrade to the latest version to prevent this issue.

What to do
  • Update progress software ws_ftp server to version 2024.0.7 or later.
Affected software
VendorProductAffected versions
progress software ws_ftp server < 2024.0.7
Original advisory text
Pre-Authentication SSH Denial of Service via Malformed Public-Key Signature in Progress WS_FTP Server
A remote attacker who knows a valid account's enrolled SSH public key can terminate the shared SSH service in Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker partial control
Severity
7.5 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-20Improper Input Validation
CWE-125Out-of-bounds Read
Timeline
Published29 Oct 2026
Updated4 Nov 2026
First seen29 Oct 2026
Sources
CVE-2026-90869 · NVD
CVE-2026-90869 · MITRE
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