{"id":"CVE-2011-2523","url":"https://www.cyber-defence.io/tools/cve/CVE-2011-2523","generatedAt":"2026-11-05T02:30:35.598Z","title":"vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.","description":"vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.","published":"2019-11-27T21:15:12.000Z","lastModified":"2026-06-16T23:31:31.000Z","status":"Modified","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-78"],"affected":["vsftpd project/vsftpd","debian/debian linux"],"epss":{"score":0.96184,"percentile":0.99878,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":2,"verified":true,"firstPublished":"2011-07-05","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":49757,"kind":"exploit","title":"vsftpd 2.3.4 - Backdoor Command Execution","url":"https://www.exploit-db.com/exploits/49757","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/unix/remote/49757.py","file":"exploits/unix/remote/49757.py","published":"2021-04-12","added":"2021-04-12","updated":"2021-07-16","author":"HerculesRD","type":"remote","platform":"unix","port":null,"verified":true,"codes":["CVE-2011-2523"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null},{"edbId":17491,"kind":"exploit","title":"vsftpd 2.3.4 - Backdoor Command Execution (Metasploit)","url":"https://www.exploit-db.com/exploits/17491","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/unix/remote/17491.rb","file":"exploits/unix/remote/17491.rb","published":"2011-07-05","added":"2011-07-05","updated":"2021-04-12","author":"Metasploit","type":"remote","platform":"unix","port":null,"verified":true,"codes":["OSVDB-73573","CVE-2011-2523"],"tags":"Metasploit Framework (MSF)","aliases":null,"applicationUrl":"http://www.exploit-db.comvsftpd-2.3.4.tar.gz","screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 96.2%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.html","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/cve-2011-2523","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"secalert@redhat.com"},{"url":"https://security-tracker.debian.org/tracker/CVE-2011-2523","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://www.openwall.com/lists/oss-security/2011/07/11/5","tags":["Mailing List","Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"http://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/security/cve/cve-2011-2523","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security-tracker.debian.org/tracker/CVE-2011-2523","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.openwall.com/lists/oss-security/2011/07/11/5","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2011-2523","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}