What’s Vulnerable › Vulnerabilities

CVE-2010-20049: LeapFTP < 3.1.x Stack Buffer Overflow

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% 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-121

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.

Affected products

• LeapWare LeapFTP: 3.1.x

References

• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/leapftp_list_reply.rb
• https://web.archive.org/web/20111013232627/http://www.leapware.com/
• https://web.archive.org/web/20111016194057/https://www.corelan.be/index.php/2010/10/12/death-of-an-ftp-client/
• https://www.exploit-db.com/exploits/16704
• https://www.vulncheck.com/advisories/leapftp-stack-buffer-overflow
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/leapftp_list_reply.rb
• https://www.exploit-db.com/exploits/16704

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