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

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CRITICAL

EChat Server 3.1 Buffer Overflow via chat.ghp username Parameter

Published Mar 28, 2026

9.3

CRITICAL

CVSS 4.0

EPSS 0.82%

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

Vendor Echatserver Product EChat Server Default
n/a
- Version
  3.1
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Echatserver

EChat Server

n/a

Version	Status	Constraints
3.1	affected	-

Remediation

No remediation recorded yet.

Metrics

0.82% 0.00822

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.00822

Score over time

Mar–Oct 2026

EPSS v4
EPSS v5

Percentile over time

EPSS v4
EPSS v5

Table of values (3 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 2, 2026	0.82% (0.00822)	55.79th	v5 (v2026.06.15)
Jun 15, 2026	0.82% (0.00822)	52.34th	v5 (v2026.06.15)
Mar 28, 2026	0.21% (0.00207)	43.08th	v4 (v2025.03.14)

Weaknesses (1)

CWE-787

Out-of-bounds Write

References (2)

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

Link	Providers	Tags
https://www.exploit-db.com/exploits/44155		exploit
https://www.vulncheck.com/advisories/echat-server-buffer-overflow-via-chat-ghp-username-parameter		third-party-advisoryThird Party Advisory