CVE-2018-25221 | EChat Server 3.1 contains a buffer overflow vulnerability in… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2018-25221
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-03-28 11:47 UTC
Published: 2026-03-28 11:58 UTC
Last updated: 2026-03-30 15:52 UTC
Primary CWE: CWE-787
Out-of-bounds Write
Vendor / Product: Echatserver / EChat Server
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Echatserver	EChat Server	—	3.1

Weakness (CWE)

CWE	Source	Description
CWE-787	cna	Out-of-bounds Write

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3	CRITICAL	4.0	cna	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

References (2)

ExploitDB-44155 https://www.exploit-db.com/exploits/44155
VulnCheck Advisory: EChat Server 3.1 Buffer Overflow via chat.ghp username Parameter https://www.vulncheck.com/advisories/echat-server-buffer-overflow-via-chat-ghp-username-parameter