CVE-2021-35211 CRITICAL

CVE-2021-35211: Serv-U Remote Memory Escape Vulnerability

Vendor Solarwinds
Product Serv-U Managed File Transfer Server and Serv-U Secured FTP
KEV Status Known Exploited
Ransomware Used in campaigns
Published July 14, 2021
Last update October 21, 2025
View on NVD All CVEs

CVSS base score

9.0/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

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.

CISA mandated remediation

02CISA Required Action

Apply updates per vendor instructions.

Key dates

03Disclosure timeline

July 14, 2021 CVE published
October 21, 2025 Record updated