CVE-2012-10055CWE-134

ComSndFTP v1.3.7 Beta USER Format String RCE

Critical · published August 13, 2025

CVSS v4.0
9.3
EPSS
2%
Percentile
83.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
9.3 · CRITICAL
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
EPSS
0.02371 · 83.6th percentile
Weakness
CWE-134 · Use of Externally-Controlled Format String
Published
2025-08-13T20:33Z
EPSS history
Timeline
  • 13 AUG 20:33Z
    ComSndFTP v1.3.7 Beta USER Format String RCE
    cvelistv5