Stack-Based Buffer Overflow Vulnerability in Achat by Achat Software
CVE-2025-34127

9.3CRITICAL

Key Information:

Vendor

Achat Software

Status
Achat Chat Server
Vendor
CVE Published:
16 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-34127?

A stack-based buffer overflow vulnerability exists in Achat version 0.150, which can be exploited by sending specially crafted messages to UDP port 9256. This vulnerability stems from insufficient bounds checking of user input, allowing attackers to overwrite the structured exception handler (SEH) and potentially execute arbitrary code remotely.

Affected Version(s)

Achat Chat Server Windows 0.150

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-2025-34127 - Proof of Concept

CVE-2025-34127 - Proof of Concept

References

https://raw.githubusercontent.com/rapid7/metasploit-frame...
exploit
https://www.vulncheck.com/advisories/achat-seh-buffer-ove...
third-party-advisory
https://www.exploit-db.com/exploits/36056
exploit

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
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

Peter Kasza
.