Buffer Overflow Vulnerability in LanHelper by HainSoft
CVE-2019-25660

6.9MEDIUM

Key Information:

Vendor

Hainsoft

Status
Lanhelper
Vendor
CVE Published:
5 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2019-25660?

LanHelper 1.74 is susceptible to a local buffer overflow vulnerability that can lead to application crashes. This vulnerability enables attackers to exploit the Form Send Message feature by entering excessively long input strings, specifically by pasting 6000 bytes of data into the Message text field, which subsequently triggers a denial of service condition. This flaw highlights the need for developers to implement proper input validation to prevent such vulnerabilities.

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Affected Version(s)

LanHelper 1.74

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2019-25660 - Proof of Concept

References

https://www.exploit-db.com/exploits/46295
exploit
http://www.hainsoft.com/
product
https://www.vulncheck.com/advisories/lanhelper-denial-of-...
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Rafael Pedrero
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