CVE-2026-90869
Pre-Authentication SSH Denial of Service via Malformed Public-Key Signature in Progress WS_FTP Server
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-125 CWE-20 |
| Vendor | progress software |
| Product | ws_ftp server |
| Published | Oct 29, 2026 |
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CVSS v3 Breakdown
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
Affected Versions
Progress Software / WS_FTP Server
0 < 2024.0.7 0 < 2025.0.4
References
Credits
Niv Levy (restricted)