CVE-2018-25221: Echatserver Easy Chat Server

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

EChat Server 3.1 contains a buffer overflow vulnerability in the chat.ghp endpoint that allows remote attackers to execute arbitrary code by supplying an oversized username parameter. Attackers can send a GET request to chat.ghp with a malicious username value containing shellcode and ROP gadgets to achieve code execution in the application context.

Affected products

• Echatserver Easy Chat Server: up to and including 3.1

Published 2026-03-28. Last modified 2026-06-17.