CVE-2018-25221: EChat Server 3.1 Buffer Overflow via chat.ghp username Parameter

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-28 · updated 2026-06-17
Weakness: CWE-787

Description

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: through 3.1

References

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

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