CVE-2011-10029

published 2025-08-20

CVE-2011-10029: 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…

Priority P2 58 high 8.7 CVSS 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

EXPLOIT

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

1 ranges

Vendor	Product	Version range	Fixed in
flexbyte_software	solar_ftp_server	<= 2.1.1	—

Detection & IOCs extracted from sources · hover to see the quote

command USER %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s↗

process sfsservice.exe↗

• → Monitor FTP USER commands containing format specifier characters (e.g., %s, %x, %n) sent to Solar FTP Server; such input triggers a read access violation in __output_1() of sfsservice.exe ↗
• → Alert on unexpected termination or crash of the sfsservice.exe process, which is indicative of successful DoS exploitation ↗

• · Vulnerability affects Solar FTP Server versions 2.1.1 and earlier only; verify target version before applying detections ↗

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