CVE-2010-20049 LeapFTP < 3.1.x Stack Buffer Overflow
A stack buffer overflow in LeapFTP allows remote code execution via a malicious FTP server sending long filenames.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2010-20049?
CVE-2010-20049 is a critical memory corruption vulnerability in LeapWare LeapFTP, published on 20 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-121
Which versions are affected by CVE-2010-20049?
How do I fix CVE-2010-20049?
No fix has been published for CVE-2010-20049 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2010-20049 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2010-20049 exists.
Public exploit code: 1 Metasploit module.
Sources
Also known as GHSA-fh65-c5x2-5936.