Vulnerability · Published Oct 29, 2026 · Assigned by ProgressSoftware
CVE-2026-90870Unauthenticated Ad Hoc Transfer Resource Exhaustion in Progress WS_FTP Server
Medium 5.3
In plain English
A medium-severity uncontrolled resource consumption in WS_FTP Server from Progress Software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 80.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A missing release of backend receiver sessions in the Ad Hoc Transfer component of Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could lead to server resource exhaustion and service degradation.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Progress Software | WS_FTP Server | 0 – before 2024.0.70 – before 2025.0.4 |
Weakness: CWE-400, CWE-772 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L