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CVE-2021-35211

Serv-U Remote Memory Escape Vulnerability

Published: Jul 14, 2021Updated: Oct 27, 2025 Sources: CVE List NVD BDU
NVD MITRE
9.0CVSS
CRITICAL

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.

EPSS Score
94.3%
Top 0.0%
CISA KEV
Active Exploitation
Since Nov 3, 2021
Exploits
No Known Exploits
Remediation
Patch Available

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High

Weaknesses

CWE-787

Affected Products

Serv-U File Server
SolarWinds Inc.
serv-u
solarwinds
Serv-U Managed File Transfer Server and Serv-U Secured FTP
SolarWinds

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Nov 3, 2021
Remediation due:Nov 17, 2021
Ransomware:Known ransomware use

Required action: Apply updates per vendor instructions.

Official Patch Available
Workaround Available

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MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploit
microsoft.com
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211
solarwinds.com
https://nvd.nist.gov/vuln/detail/CVE-2021-35211
nvd.nist.gov
and 4 more references View all →

Timeline

Published
Jul 14, 2021
Added to CISA KEV
Nov 3, 2021
Last Updated
Oct 27, 2025
News mentions
2

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