CVE-2011-2523
vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.
Does this matter?
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.
Description
vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 96.18% probability · 100th percentile
- Public exploits
- 2 in Exploit-DB · verified · first 5 July 2011
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- vsftpd project/vsftpd · debian/debian linux
- Source
- secalert@redhat.com
EPSS 96.2% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (2)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.html
- https://access.redhat.com/security/cve/cve-2011-2523Third Party Advisory
- https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.htmlExploit, Third Party Advisory, VDB Entry
- https://security-tracker.debian.org/tracker/CVE-2011-2523Third Party Advisory
- https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805Third Party Advisory
- https://www.openwall.com/lists/oss-security/2011/07/11/5Mailing List, Third Party Advisory
- http://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.html
- https://access.redhat.com/security/cve/cve-2011-2523Third Party Advisory
- https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.htmlExploit, Third Party Advisory, VDB Entry
- https://security-tracker.debian.org/tracker/CVE-2011-2523Third Party Advisory
- https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805Third Party Advisory
- https://www.openwall.com/lists/oss-security/2011/07/11/5Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.