CVE-2025-34107Public exploitNetwork attack vector

Code execution via oversized FTP server banner

Published Jul 15, 2025 · Updated Apr 7, 2026

Stack-based buffer overflow in LabF WinaXe FTP Client 7.7 allows remote attackers to execute code via a crafted FTP server banner. The WCMDPA10.dll banner parser accepts an oversized 220 Server Ready response into a stack buffer, overwriting control data. The client must connect to an attacker-controlled FTP server; successful execution uses the connecting user's privileges.

CVSS severity8.7
High
EPSS probability1.13%
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 LabF WinaXe FTP Client 7.7 allows remote attackers to execute code via a crafted FTP server banner. The WCMDPA10.dll banner parser accepts an oversized 220 Server Ready response into a stack buffer, overwriting control data. The client must connect to an attacker-controlled FTP server; successful execution uses the connecting user's privileges.

The record

CVE
CVE-2025-34107
Published
Jul 15, 2025
Updated
Apr 7, 2026
Vendor
LabF
Product
WinaXe FTP Client
Classifications
CWE-121, CAPEC-100, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 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=7.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LabF · WinaXe FTP Clientversion=7.7

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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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