Unauthenticated code execution via oversized MLS argument
Published May 3, 2025 · Updated May 6, 2025
Buffer overflow in PCMan FTP Server 2.0.7 allows remote attackers to execute arbitrary code through a crafted FTP command. The CNA labels the affected locus as the TYPE command handler, while its linked exploit sends a 2,006-byte MLS argument that overwrites the saved instruction pointer and transfers execution to attacker-supplied Windows shellcode. The exploit reaches the handler after anonymous FTP authentication and demonstrates control of the server process on 32-bit Windows XP.
Summary
What happened
Buffer overflow in PCMan FTP Server 2.0.7 allows remote attackers to execute arbitrary code through a crafted FTP command. The CNA labels the affected locus as the TYPE command handler, while its linked exploit sends a 2,006-byte MLS argument that overwrites the saved instruction pointer and transfers execution to attacker-supplied Windows shellcode. The exploit reaches the handler after anonymous FTP authentication and demonstrates control of the server process on 32-bit Windows XP.
The record
- CVE
- CVE-2025-4239
- Published
- May 3, 2025
- Updated
- May 6, 2025
- Vendor
- PCMan
- Product
- PCMan FTP Server
- Classifications
- CWE-120, CWE-119, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 3, 2025CVE publishedPublication date reported by the CVE source.
- May 6, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.0.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
- PCMan FTP Server 2.0.7 MLS Remote Buffer Overflowweaponized · unverified
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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