How to find SolarWinds Serv-U systems on your network

|
Updated

Latest SolarWinds vulnerability #

Microsoft recently notified SolarWinds that they had discovered a remote code execution vulnerability in Serv-U Managed File Transfer and Serv-U Secure FTP. The vulnerability being exploited is CVE-2021-35211 and only exists when SSH is enabled in Serv-U environments.

SolarWinds has issued a hotfix and recommends customers log into their customer portals to access these updates. You will need to install these updates immediately.

Finding SolarWinds Serv-U systems with runZero #

With runZero you can find Serv-U servers with SSH enabled in your inventory with this pre-built query. This query identifies SSH services that use the insecure Serv-U key or the Serv-U banner.

_asset.protocol:ssh AND protocol:"ssh" AND (banner:"SSH-2.0-Serv-U" OR ssh.hostKey.md5:"=e4:dd:11:2e:82:34:ab:62:59:1c:c8:62:1d:4b:48:99")

As always, any prebuilt queries we create are available from our Queries Library. Check out the library for other useful inventory queries.

Written by runZero Team

Due to the nature of their research and out of respect for their privacy, runZero team members prefer to remain anonymous. Their work is published under the runZero name.

More about runZero Team
Subscribe Now

Get the latest news and expert insights delivered in your inbox.

Welcome to the club! Your subscription to our newsletter is successful.


Explore more

Webcasts
The Unreasonable Effectiveness of Inside Out Attack Surface Management
HD Moore, founder of runZero (and previously Metasploit), presents new research that will forever redefine how you approach attack surface...
Webcasts
Safeguarding OT/ICS Assets: Insights from the U.S. Department of Energy
Security experts from the National Renewable Energy Lab’s (NREL) Clean Energy Cybersecurity Accelerator™ (CECA) program join runZero to discuss...
runZero Insights
Ensure compliance with DORA’s ICT risk framework using runZero
Learn how to uncover unmanaged and unknown assets— including IT, OT, and IoT— to meet DORA's hidden risk requirements using runZero.
Talks
DEF CON 32: SSHamble: Unexpected Exposures in SSH (Video)
This talk digs deep into SSH, the lesser-known implementations, many of the surprising security issues found along the way, and how to exploit them.

See Results in Minutes

Get complete visibility into IT, OT, & IoT — without agents, credentials, or hardware.

© Copyright 2025 runZero, Inc. All Rights Reserved