SolarWinds Serv-U FTP Server 15.2.1 Path Traversal

CVE Category Price Severity
CVE-2020-27994 CWE-22 Not disclosed High
Author Risk Exploitation Type Date
Lior Simon High Remote 2021-02-13
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at:

Below is a copy:

SolarWinds Serv-U FTP Server 15.2.1 Path Traversal
Title: Path traversal


Product: SolarWinds Serv-U FTP Server


Vendor Homepage:


Vulnerable Version: 15.2.1 and lower


Fixed Version: 15.2.2


CVE Number: CVE-2020-27994


Author: Jack Misiura from The Missing Link 






2020-10-28 Disclosed to Vendor

2021-01-21 Vendor releases patched version

2021-08-02 Publication


1. Vulnerability Description


SolarWinds Serv-U File Server through 15.2.1 does not correctly validate path information, allowing the disclosure of files and directories outside of the user's home directory via a specially crafted GET request.



2. PoC


On a vulnerable Serv-U installation issue the following GET request to get a listing of files and directories above the user's directory:


https://<serv-u host>/Web Client/?Command=List&dir=\..\*.*


The user *MUST* be locked to their directory, and only access granted must be the said directory. Directory listing must be enabled. If any of the above is not present, the exploit will not work.


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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