Security readout for executives and security teams
Plain-English summary
A compromised official ProFTPD 1.3.3c source release reportedly contained a backdoor. If an organization installed that tainted build, a remote attacker could run operating-system commands as root through the FTP service. Exposure is narrow by version and installation source, but impact is full server compromise.
Executive priority
Prioritize immediately if any legacy ProFTPD 1.3.3c server remains deployed, especially if internet-facing. The business risk is complete host takeover, not just FTP data exposure.
Technical view
The issue affects ProFTPD 1.3.3c source tarballs distributed from November 28 to December 2, 2010. The backdoor added a hidden FTP command trigger enabling unauthenticated remote command execution with root privileges. The CVE maps to CWE-912 and carries CVSS 4.0 score 9.3.
Likely exposure
Most likely exposed systems are legacy ProFTPD 1.3.3c servers built from the compromised upstream source tarball. Systems using other ProFTPD versions are listed as unaffected in the bundle. Distribution package exposure is not established by the provided evidence.
Exploitation context
Public exploit references exist in Metasploit and Exploit-DB, but the bundle does not identify CISA KEV listing or current active exploitation. Treat internet-facing affected FTP servers as urgent because exploitation requires no authentication and can lead to root-level command execution.
Researcher notes
The strongest evidence is version-specific: ProFTPD 1.3.3c source tarball compromise during a short 2010 window. Public exploit artifacts support exploitability, but not active exploitation. Validate provenance before declaring exposure.
Mitigation direction
- Identify and remove any ProFTPD 1.3.3c build from the compromised source window.
- Reinstall or upgrade ProFTPD from a trusted current vendor source or package repository.
- Review vendor guidance before selecting replacement versions or cleanup actions.
- Restrict FTP exposure to required networks while remediation is underway.
- Rotate credentials and investigate affected hosts for post-compromise activity.
Validation and detection
- Inventory ProFTPD versions across servers, containers, images, and backups.
- Confirm whether any 1.3.3c installation came from the affected source tarball dates.
- Check internet-facing FTP services for ProFTPD exposure.
- Review system and security logs for suspicious root processes tied to FTP service activity.
- Confirm remediated hosts run a trusted, non-affected ProFTPD build.
Public sources used
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.
CWE-912: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2010-20103 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
- Critical
- CVSS
- 9.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://web.archive.org/web/20111107212129/http://rsync.proftpd.org/CVE reference · vendor-advisory, patch
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/ftp/proftpd_133c_backdoor.rbCVE reference · exploit
- https://www.exploit-db.com/exploits/15662CVE reference · exploit
- https://www.exploit-db.com/exploits/16921CVE reference · exploit
- https://advisories.checkpoint.com/defense/advisories/public/2011/cpai-2010-151.html/CVE reference · third-party-advisory
- https://github.com/proftpd/proftpdCVE reference · product
- https://www.vulncheck.com/advisories/proftpd-backdoor-command-executionCVE reference · third-party-advisory
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.
Hidden Functionality
Hidden Functionality represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.