SolarWinds Serv-U FTP Server 15.2.1 Cross Site Scripting

CVE Category Price Severity
CVE-2020-28001 CWE-79 $5,000 High
Author Risk Exploitation Type Date
Unknown High Remote 2021-02-13
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 0 0

CVSS vector description

Our sensors found this exploit at:

Below is a copy:

SolarWinds Serv-U FTP Server 15.2.1 Cross Site Scripting
Title: Stored XSS


Product: SolarWinds Serv-U FTP Server


Vendor Homepage:


Vulnerable Version: 15.2.1 and lower


Fixed Version: 15.2.2


CVE Number: CVE-2020-28001


Author: Jack Misiura from The Missing Link 






2020-10-30 Disclosed to Vendor

2021-01-21 Vendor releases patched version

2021-08-02 Publication


1. Vulnerability Description


SolarWinds Serv-U FTP server through 15.2.1 does not correctly sanitize and validate the user-supplied directory names, allowing malicious users to create directories that when clicked on (in the breadcrumb menu) will trigger XSS payloads.


2. PoC


On a vulnerable Serv-U FTP server installation, create a directory named as such:




The payload contains ');a=function(b) { alert("XSS"); };a('


As soon as a user clicks on the directory name in the breadcrumb menu, it will trigger the stored XSS.


3. Solution


The vendor provides an updated version (15.2.2) which should be installed immediately.


4. Advisory URL


Jack Misiura

Application Security Consultant


911 Dickson Avenue





1300 865 865


+61 2 8436 8585











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