Serv-U
CVE-2021-35242: A valid CSRF token is present in response to an invalid request
Serv-U server responds with valid CSRFToken when the request contains only Session.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityHIGHCVSS 3.1 8.3
EPSS0.79%Chance of exploitation in 30 days
Public exploitNot tracked
FixAvailable
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Serv-U Server 15.2 | 15.2.5 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
Serv-U server responds with valid CSRFToken when the request contains only Session.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.