CVE-2011-2523
CRITICALvsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Description
vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.
Affected Products
debian linuxdebianvsftpdvsftpd_projectResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
vsftpd 2.3.4 - Backdoor Command Execution (Metasploit)
by Metasploit · Jul 5, 2011
vsftpd 2.3.4 - Backdoor Command Execution
by HerculesRD · Apr 12, 2021
Frequently Asked Questions
Is CVE-2011-2523 in your stack?
O3 detects CVE-2011-2523 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.