Pre-Authentication SSH Denial of Service via Malformed Public-Key Signature in Progress WS_FTP Server

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90869
StatePUBLISHED
AssignerProgressSoftware
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-29 16:20:05 UTC
Updated2026-10-29 16:24:53 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-20 | CWE-125 | CWE-125 CWE-125: Out-of-bounds Read | CWE-20 CWE-20: Improper Input Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Progress Software WS FTP Server affected 2024.0.7 custom Windows
CNA Progress Software WS FTP Server affected 2025.0.4 custom Windows

References

ReferenceSourceLinkTags
progress.lightning.force.com/lightning/r/Knowledge__kav/ka7Pb000001vl86IAA/view [email protected] progress.lightning.force.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Niv Levy (restricted) (en)

Additional Advisory Data

Workarounds

CNA: Restrict network access to the SSH/SFTP service to trusted clients and disable SSH/SFTP access if it is not required. Contact Progress Software Technical Support for guidance on available mitigations.

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