What’s Vulnerable › Vulnerabilities

CVE-2012-10055: ComSndFTP v1.3.7 Beta USER Format String RCE

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-13 · updated 2026-06-16
• Weakness: CWE-134

Description

ComSndFTP FTP Server version 1.3.7 Beta contains a format string vulnerability in its handling of the USER command. By sending a specially crafted username containing format specifiers, a remote attacker can overwrite a hardcoded function pointer in memory (specifically WSACleanup from Ws2_32.dll). This allows the attacker to redirect execution flow and bypass DEP protections using a ROP chain, ultimately leading to arbitrary code execution. The vulnerability is exploitable without authentication and affects default configurations.

Affected products

• ComSndFTP FTP Server: 1.3.7 Beta

References

• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/comsnd_ftpd_fmtstr.rb
• https://web.archive.org/web/20120317214524/http://ftp.comsnd.com/
• https://www.exploit-db.com/exploits/19024
• https://www.exploit-db.com/exploits/19177
• https://www.vulncheck.com/advisories/comsndftp-user-format-string-rce
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/comsnd_ftpd_fmtstr.rb
• https://www.exploit-db.com/exploits/19024
• https://www.exploit-db.com/exploits/19177

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