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Vulnerabilities

Security incident · CVE-2010-20049

LeapFTP < 3.1.x contains a stack-based buffer overflow vulnerability in its FTP client parser.

Published Aug 20, 2025 · catalog updated May 15, 2026 · LeapWare LeapFTP

Check if you run it

No confirmed exploitation is on record for CVE-2010-20049. EPSS is 1.19%. Act only if a listed version of LeapWare LeapFTP is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.19%
Remediation
Version ranges on file
Affected products
vendor LeapWare LeapFTP 0 <3.1.*

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor LeapWare LeapFTP 0 <3.1.*0 <3.1.*

How to fix CVE-2010-20049

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2010-20049. EPSS is 1.19%. Act only if a listed version of LeapWare LeapFTP is installed.

Which versions are affected?

Compare what you have installed with LeapWare LeapFTP 0 <3.1.* 0 <3.1.*. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.19%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 20, 2025 · EUVD

    Detected

    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

  2. May 15, 2026 · EUVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2010-20049

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2010-20049

    30-day exploitation probability 1.19%

    first.org
  • EUVDVulnerability recordEUVD-2010-5303

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 21, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.