CVE-2010-20049

Critical

Description

LeapFTP < 3.1.x contains a stack-based buffer overflow vulnerability in its FTP client parser. When the client receives a directory listing containing a filename longer than 528 bytes, the application fails to properly bound-check the input and overwrites the Structured Exception Handler (SEH) chain. This allows an attacker operating a malicious FTP server to execute arbitrary code on the victim’s machine when the file is listed or downloaded.

SeverityCritical

CVSS9.3

Exploit probability—

ProductLeapFTP

PublishedAug 20, 2025

First seenAug 20, 2025

Weakness typeCWE-121CWE-121

How to fix

Update

LeapWare LeapFTP3.1.* or later

Patches

web.archive.org/web/20111013232627/http://www.leapware.com/

Affected products

Product	Affected versions	Fixed in
LeapWare LeapFTP	v < 3.1.*	3.1.*

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