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CVE-2011-2523
vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.
Critical9.8EPSS 96.2%
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 96.2% · top 0.1% of all CVEs (3 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
Affected products
vsftpd · vsftpd
- affected 2.3.4 downloaded between 20110630 and 20110703
References (6)
- https://security-tracker.debian.org/tracker/CVE-2011-2523 (opens in a new tab)x_refsource_MISCx_transferred
- https://access.redhat.com/security/cve/cve-2011-2523 (opens in a new tab)x_refsource_MISCx_transferred
- [oss-security] 20110711 Re: vsftpd download backdoored (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805 (opens in a new tab)x_refsource_MISCx_transferred
- https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html (opens in a new tab)x_refsource_MISCx_transferred
- http://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.html (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2011-2523)Record last updated .