CVE-2021-35211

CriticalCVSS 10.0/10Known exploited (CISA KEV)Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 10.0/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-787

Affected software

Vendor	Product	Versions
SolarWinds	Serv-U Managed File Transfer Server and Serv-U Secured FTP	>= SolarWinds Serv-U, < 15.2.3 HF1

References

https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploitPatch, Vendor Advisory
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211Patch, Vendor Advisory
https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploitPatch, Vendor Advisory
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211Patch, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35211US Government Resource

Timeline

Published: Jul 14, 2021
Last modified: Jun 17, 2026
Added to CISA KEV: Nov 3, 2021
NVD status: Analyzed

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