CVE-2021-35211: SolarWinds Serv-U Remote Code Execution Vulnerability

Critical severity, CVSS 10.0. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 91.2% chance of exploitation in the next 30 days.

Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Memory Escape Vulnerability. If exploited, a threat actor may be able to gain privileged access to the machine hosting Serv-U Only. SolarWinds Serv-U Managed File Transfer and Serv-U Secure FTP for Windows before 15.2.3 HF2 are affected by this vulnerability.

Affected products

• SolarWinds Serv-U: before 15.2.3 (fixed in 15.2.3); version 15.2.3 only

Published 2021-07-14. Last modified 2026-06-17.