CVE-2018-25221

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.

Score

CVSS 3.1 9.8 Critical

Status

Analyzed - disclosure@vulncheck.com

Published

2026-03-28

Last modified

2026-10-01

Weaknesses

CWE-787

Affected products

• Easy Chat Server (Echatserver)

References

• https://www.exploit-db.com/exploits/44155
• https://www.vulncheck.com/advisories/echat-server-buffer-overflow-via-chat-ghp-username-parameter