Buffer overflow in Leapware Leapftp
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.
Vulnerability class: Buffer Overflow
Published · last modified .
EPSS exploit prediction
EPSS: 0.008 (54.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Leapware Leapftp — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/w… (exploit)
- www.exploit-db.com/exploits/16704 (exploit)
- web.archive.org/web/20111016194057/https://www.corelan.be/index.php/2010/10/12/… (technical-description, exploit)
- web.archive.org/web/20111013232627/http://www.leapware.com/ (vendor-advisory, patch)
- www.vulncheck.com/advisories/leapftp-stack-buffer-overflow (third-party-advisory)
Frequently asked questions
- What is CVE-2010-20049?
- CVE-2010-20049 is a vulnerability in Leapware Leapftp, classified under Stack-based Buffer Overflow. Published 2025-08-20.
- Is CVE-2010-20049 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.