CVE-2025-34127: Achat Software Achat Chat Server

Critical severity, CVSS 9.3. EPSS: 1.7% chance of exploitation in the next 30 days.

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.

Affected products

Published 2025-07-16. Last modified 2026-06-17.