Serv U
CVE-2021-35211
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
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.
AnalysisAI
Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Memory Escape Vulnerability. Rated critical severity (CVSS 10.0), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Out-of-bounds Write vulnerability could allow attackers to write data beyond allocated buffer boundaries leading to code execution or crashes.
Technical ContextAI
This vulnerability is classified as Out-of-bounds Write (CWE-787), which allows attackers to write data beyond allocated buffer boundaries leading to code execution or crashes. 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 include: Solarwinds Serv-U. Version information: before 15.2.3.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Validate write boundaries, use memory-safe languages, enable compiler protections (ASLR, stack canaries).
Remote denial-of-service in SolarWinds Serv-U allows unauthenticated attackers to crash the Serv-U service by sending sp
SolarWinds Serv-U was susceptible to a directory transversal vulnerability that would allow access to read sensitive fil
In SolarWinds Serv-U before 15.2.2 Hotfix 1, there is a directory containing user profile files (that include users' pas
A denial of service vulnerability in SolarWinds Serv-U before 15.1.6 HFv1 allows an authenticated user to crash the appl
Share/IncomingWizard.htm in SolarWinds Serv-U before 15.2.3 mishandles the user-supplied SenderEmail parameter, aka "Sha
Second type confusion vulnerability in SolarWinds Serv-U. Different attack vector from CVE-2025-40539 but same impact —
Type confusion vulnerability in SolarWinds Serv-U enables arbitrary code execution. Second critical Serv-U vulnerability
Broken access control in SolarWinds Serv-U allows unauthorized user creation by exploiting privilege assignment flaws. F
IDOR vulnerability in SolarWinds Serv-U allows accessing objects belonging to other users. Fourth critical Serv-U vulner
SolarWinds Serv-U is vulnerable to a directory traversal vulnerability where remote code execution is possible depending
Serv-U server responds with valid CSRFToken when the request contains only Session. Rated high severity (CVSS 8.8), this
The Serv-U File Server allows for events such as user login failures to be audited by executing a command. Rated high se
Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Buffer Overflow
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External POC / Exploit Code
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