vulnerability

SolarWinds Serv-U: CVE-2021-35223: Execute Command Function Allows RCE Vulnerability

Try Surface Command

Back to search

Severity

CVSS

(AV:N/AC:L/Au:S/C:P/I:P/A:P)

Published

Aug 20, 2021

Added

Aug 1, 2025

Modified

May 14, 2026

Description

The Serv-U File Server allows for events such as user login failures to be audited by executing a command. This command can be supplied with parameters that can take the form of user string variables, allowing remote code execution.

Solution

solarwinds-serv-u-upgrade-latest

References

CWE-20
CVE-2021-35223
https://attackerkb.com/topics/CVE-2021-35223
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35223
https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-21866

Rapid7 Labs

2026 Global Threat Landscape Report

The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.

Get report