CVE-2018-25221CWE-787

EChat Server 3.1 Buffer Overflow via chat.ghp username Parameter

Critical · published March 28, 2026

CVSS v4.0
9.3
EPSS
1%
Percentile
56.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
9.3 · CRITICAL
Vector
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
EPSS
0.00822 · 56.6th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-03-28T11:58Z
EPSS history
Timeline
  • 28 MAR 11:58Z
    EChat Server 3.1 Buffer Overflow via chat.ghp username Parameter
    cvelistv5