SolarWinds · Serv-U
CVE-2021-35211
Serv-U Remote Memory Escape Vulnerability
What it is
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: SolarWinds Serv-U contains an unspecified memory escape vulnerability which can allow for remote code execution.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: November 17, 2021
More exploited flaws from SolarWinds
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Jun 5, 2026 | Uncontrolled Resource Consumption | Serv-U | High 7.5 | 44% |
| Jul 17, 2024 | Path Traversal Vulnerability | Serv-U | High 8.6 | 99.6% |
| Jan 21, 2022 | Improper Input Validation | Serv-U | Medium 4.3 | 3.5% |
| Mar 9, 2026 | Deserialization of Untrusted Data | Web Help Desk | Critical 9.8 | 90% |
| Feb 12, 2026 | Security Control Bypass | Web Help Desk | High 8.1 | 74% |
| Feb 3, 2026 | Deserialization of Untrusted Data | Web Help Desk | Critical 9.8 | 84% |
| Oct 15, 2024 | Hardcoded Credential | Web Help Desk | Critical 9.1 | 93% |
| Aug 15, 2024 | Deserialization of Untrusted Data | Web Help Desk | Critical 9.8 | 85% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.