RCE in Vsftpd
CVE-2011-2523
vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.962 (99.9th percentile), scored .
Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 99.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.962 · newest: 0.962 · change: 0.000
Affected products
- Vsftpd — versions 2.3.4 downloaded between 20110630 and 20110703
- Vsftpd Project — versions 2.3.4
- Debian Linux — versions 8.0, 9.0, 10.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-tracker.debian.org/tracker/CVE-2011-2523 (Third Party Advisory)
- access.redhat.com/security/cve/cve-2011-2523 (Third Party Advisory)
- www.openwall.com/lists/oss-security/2011/07/11/5 (mailing-list, Mailing List, Third Party Advisory)
- vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805 (Third Party Advisory)
- packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.ht… (Exploit, VDB Entry, Third Party Advisory)
- packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.ht…
Frequently asked questions
- What is CVE-2011-2523?
- CVE-2011-2523 is a critical-severity vulnerability in Vsftpd, classified under OS Command Injection. CVSS score: 9.8/10. Published 2019-11-27.
- How severe is CVE-2011-2523?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2011-2523 known to be exploited?
- 354 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.