Security readout for executives and security teams
This is a supply-chain backdoor, not a normal software bug. Certain vsftpd 2.3.4 downloads from June 30 to July 3, 2011 contained malicious code that opened a shell on TCP port 6200. Any affected internet-facing FTP server should be treated as potentially fully compromised. Exposure is likely rare today but severe where present. Focus on legacy Linux systems, old FTP services, archived appliances, lab images, and systems that installed vsftpd 2.3.4 from upstream downloads during the affected dates. Prioritize confirmation over broad panic. The affected window is narrow and old, but any confirmed instance is a critical compromise risk requiring removal and incident response. Mitigation focus: Remove any affected vsftpd 2.3.4 installation immediately.; Install vsftpd only from trusted vendor repositories or verified clean source.; Check vendor guidance from Debian, Red Hat, and vsftpd-related advisories..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2011-2523 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://security-tracker.debian.org/tracker/CVE-2011-2523CVE reference · x_refsource_MISC
- https://access.redhat.com/security/cve/cve-2011-2523CVE reference · x_refsource_MISC
- [oss-security] 20110711 Re: vsftpd download backdooredCVE reference · mailing-list, x_refsource_MLIST
- https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805CVE reference · x_refsource_MISC
- https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.htmlCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.