Answer in brief
CVE-2021-35211 records a High severity vulnerability in Serv-U Remote Memory Escape Vulnerability. The current sources mark it as known exploited. The current feed maps SolarWinds/Serv-U Managed File Transfer Server and Serv-U Secured FTP (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps SolarWinds/Serv-U Managed File Transfer Server and Serv-U Secured FTP (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| SolarWinds/Serv-U Managed File Transfer Server and Serv-U Secured FTPgeneric | >=SolarWinds Serv-U <15.2.3 HF1 | 15.2.3 HF1 |
Published upstream
Jul 14, 2021
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2025
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
May 24, 2026
Added to CISA KEV
Nov 3, 2021
Evidence: source:kev:kev:kev:recordMicrosoft 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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-35211 records a High severity vulnerability in Serv-U Remote Memory Escape Vulnerability. The current sources mark it as known exploited. The current feed maps SolarWinds/Serv-U Managed File Transfer Server and Serv-U Secured FTP (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps SolarWinds/Serv-U Managed File Transfer Server and Serv-U Secured FTP (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| SolarWinds/Serv-U Managed File Transfer Server and Serv-U Secured FTPgeneric | >=SolarWinds Serv-U <15.2.3 HF1 | 15.2.3 HF1 |
Published upstream
Jul 14, 2021
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2025
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
May 24, 2026
Added to CISA KEV
Nov 3, 2021
Evidence: source:kev:kev:kev:recordMicrosoft 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.
Quoted source text, attributed separately from HOL analysis.