CVE-2025-34127 CRITICAL

CVE-2025-34127: Achat v0.150 SEH Buffer Overflow via UDP

Vendor Achat Software
Product Achat Chat Server
Weakness CWE-121
Published July 16, 2025
Last update April 7, 2026
View on NVD All CVEs

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

A stack-based buffer overflow exists in Achat v0.150 in its default configuration. By sending a specially crafted message to the UDP port 9256, an attacker can overwrite the structured exception handler (SEH) due to insufficient bounds checking on user-supplied input leading to remote code execution.

Key dates

02Disclosure timeline

July 16, 2025 CVE published
April 7, 2026 Record updated