CVE-2010-20049

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.

CVSS v4.0

9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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

0.80% chance of exploitation in the next 30 days, 54th percentile

Published

2025-08-20

Updated

2026-05-15

Proof-of-concept exploits (2)

• https://www.exploit-db.com/exploits/16704
• https://web.archive.org/web/20111016194057/https://www.corelan.be/index.php/2010/10/12/de…

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/windows/ftp/leapftp_list_reply.rb

References

• CVE Record
• NVD entry

Related

• CVE-2010-20045
• CVE-2010-2005
• CVE-2010-20042
• CVE-2010-20059
• CVE-2010-2004
• CVE-2010-2006