Remote code execution via oversized USER command
Published Aug 5, 2025 · Updated Apr 7, 2026
Stack-based buffer overflow in Freefloat FTP Server 1.0.0 allows remote attackers to execute arbitrary code through an FTP USER command. The ASCII USER command handler accepts an overly long username and exceeds the authentication stack buffer without adequate bounds validation. No authentication or user interaction is required; successful exploitation overwrites control data and runs attacker-supplied code.
Summary
What happened
Stack-based buffer overflow in Freefloat FTP Server 1.0.0 allows remote attackers to execute arbitrary code through an FTP USER command. The ASCII USER command handler accepts an overly long username and exceeds the authentication stack buffer without adequate bounds validation. No authentication or user interaction is required; successful exploitation overwrites control data and runs attacker-supplied code.
The record
- CVE
- CVE-2012-10023
- Published
- Aug 5, 2025
- Updated
- Apr 7, 2026
- Vendor
- Freefloat AB
- Product
- Freefloat FTP Server
- Classifications
- CWE-121, CAPEC-100, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 5, 2025CVE publishedPublication date reported by the CVE source.
- Apr 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=*
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Freefloat FTP Server Remote Buffer Overflowfunctional · demonstrated
- Free Float FTP Server USER Command Buffer Overflow Metasploit Moduleweaponized · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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