CVE-2018-25221

critical · 9.3

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.

9.3

CVSS

0.8%

EPSS (exploit prob.)

56th

EPSS percentile

2026-03-28

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-787

Affected products

Vendor	Product	Affected versions
echatserver	easy_chat_server	<= 3.1

Check a specific version with /api/v1/cve/match.

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2018-25221