What’s Vulnerable › Vulnerabilities

CVE-2011-10029: Solar FTP Server <= 2.1.1 Malformed USER Denial of Service

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-20 · updated 2026-06-16
• Weakness: CWE-134

Description

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 products

• Flexbyte Software Solar FTP Server: through 2.1.1

References

• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/dos/windows/ftp/solarftp_user.rb
• https://web.archive.org/web/20111009122553/http://solarftp.com/blog/news/solar-ftp-server-2-1-2.html
• https://web.archive.org/web/20111102141514/https://solarftp.com/
• https://www.exploit-db.com/exploits/16204
• https://www.vulncheck.com/advisories/solar-ftp-server-malformed-user-dos

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