CVE-2011-10029

Solar FTP Server <= 2.1.1 Malformed USER Denial of Service

Solar FTP Server fails to properly handle format strings passed to the USER command. When a specially crafted string containing format specifiers is sent, the server crashes due to a read access violation in the __output_1() function of sfsservice.exe. This results in a denial of service (DoS) condition.

Affected

Flexbyte Software · Solar FTP Server

CVSS v4.0 VULNCHECK

8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS

1.04% chance of exploitation in the next 30 days, 63rd percentile

Published

2025-08-20

Updated

2026-05-15

Proof-of-concept exploits (2)

• https://www.exploit-db.com/exploits/16204
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/do…

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/auxiliary/dos/windows/ftp/solarftp_user.rb

References

• CVE Record
• NVD entry