CVE-2010-20049Public exploitNetwork attack vector

Code execution via overlong FTP directory filename

Published Aug 20, 2025 · Updated May 15, 2026

Stack-based buffer overflow in LeapWare LeapFTP before 3.1.x allows remote attackers to execute arbitrary code via a crafted FTP listing. The FTP LIST response parser copies a filename longer than 528 bytes without adequate bounds checking, overwriting the Structured Exception Handler chain. Exploitation requires the client to connect to an attacker-controlled FTP server and list or download the crafted file, after which code runs with the client's privileges.

CVSS severity9.3
Critical
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in LeapWare LeapFTP before 3.1.x allows remote attackers to execute arbitrary code via a crafted FTP listing. The FTP LIST response parser copies a filename longer than 528 bytes without adequate bounds checking, overwriting the Structured Exception Handler chain. Exploitation requires the client to connect to an attacker-controlled FTP server and list or download the crafted file, after which code runs with the client's privileges.

The record

CVE
CVE-2010-20049
Published
Aug 20, 2025
Updated
May 15, 2026
Vendor
LeapWare
Product
LeapFTP
Classifications
CWE-121, CAPEC-100, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 2025CVE publishedPublication date reported by the CVE source.
  2. May 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.1.*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LeapWare · LeapFTPversion=0 <3.1.*

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CAPEC-100Overflow Buffers
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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