Vulnerability Report

CVE-2021-35211

RCE CISA KEV Active

Title: SolarWinds Serv-U Remote Code Execution Vulnerability

RCE, Privileged Access

Proof Of Concept

PoC Available for CVE-2021-35211

CWE Category CWE-787
Published Date Jul 14, 2021
Modified Date Oct 27, 2025
Exploit Status Available
Score 9.0 CVSS v3.1
Exploit Probability (EPSS)
94.32%

Vulnerability Summary

CVE-2021-35211: 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.

Impacted Vendors

S
solarwinds 1
C
cat_soft 1
R
rhinosoft 1

Reference Links

https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploit https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211 https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploit https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211 https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35211
CVSS v3.1
Source Entity [email protected]
Severity CRITICAL
9.0
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v3.1
Source Entity [email protected]
Severity CRITICAL
10.0
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v2.0
Source Entity [email protected]
Severity HIGH
10.0
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:L/Au:N/C:C/I:C/A:C

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-35211 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/BishopFox/CVE-2021-35211
View Code
GitHub https://github.com/NattiSamson/Serv-U-CVE-2021-35211
View Code
GitHub https://github.com/0xhaggis/CVE-2021-35211
View Code
MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected Stack

No specific products linked.