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Vulnerability record · CVE-2018-25221 · published 28 March 2026

CVE-2018-25221: Echatserver easy chat server out-of-bounds write vulnerability

EEchatserver · Easy Chat Server

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 4.0 Critical EPSS 0.82% · top 44.4% CWE-787 · Out-of-bounds write
9.3CVSS 4.0 base score
0.82%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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.

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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-25221), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.