Answer in brief
CVE-2010-20103 records a Critical severity (CVSS 9.8) vulnerability in ProFTPD 1.3.3c Backdoor Command Execution. The current sources do not mark it as known exploited. The current feed maps ProFTPD Project/ProFTPD (Professional FTP Daemon) (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. 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 ProFTPD Project/ProFTPD (Professional FTP Daemon) (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| ProFTPD Project/ProFTPD (Professional FTP Daemon)generic | 1.3.3c | Not reported |
Published upstream
Aug 20, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
A malicious backdoor was embedded in the official ProFTPD 1.3.3c source tarball distributed between November 28 and December 2, 2010. The backdoor implements a hidden FTP command trigger that, when invoked, causes the server to execute arbitrary shell commands with root privileges. This allows remote, unauthenticated attackers to run any OS command on the FTP server host.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2010-20103 records a Critical severity (CVSS 9.8) vulnerability in ProFTPD 1.3.3c Backdoor Command Execution. The current sources do not mark it as known exploited. The current feed maps ProFTPD Project/ProFTPD (Professional FTP Daemon) (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. 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 ProFTPD Project/ProFTPD (Professional FTP Daemon) (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| ProFTPD Project/ProFTPD (Professional FTP Daemon)generic | 1.3.3c | Not reported |
Published upstream
Aug 20, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
A malicious backdoor was embedded in the official ProFTPD 1.3.3c source tarball distributed between November 28 and December 2, 2010. The backdoor implements a hidden FTP command trigger that, when invoked, causes the server to execute arbitrary shell commands with root privileges. This allows remote, unauthenticated attackers to run any OS command on the FTP server host.
Quoted source text, attributed separately from HOL analysis.