CVE-2012-10055: Comsndftp FTP Server

Critical severity, CVSS 9.3. EPSS: 2.4% chance of exploitation in the next 30 days.

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: version 1.3.7 Beta only

Published 2025-08-13. Last modified 2026-06-16.