CVE-2018-25235

MEDIUM

NetworkActiv Web Server 4.0 Username Field Buffer Overflow DoS

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2018-25235. PoCs published by Victor Mondragón.

AI-analyzed exploit summary This PoC exploits a buffer overflow vulnerability in NetworkActiv Web Server 4.0 Pre-Alpha-3.7.2 by sending an overly long username (11250 'A' characters) via the 'Set username' field, causing a denial of service (DoS). The exploit requires manual steps to trigger the crash, including pasting the payload into the application's GUI.

Description

NetworkActiv Web Server 4.0 contains a buffer overflow vulnerability in the username field of the Security options that allows local attackers to crash the application by supplying an excessively long string. Attackers can trigger a denial of service by entering a crafted username value exceeding the expected buffer size through the Set username interface.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Victor Mondragón · pythondoswindows_x86-64
https://www.exploit-db.com/exploits/45302

This PoC exploits a buffer overflow vulnerability in NetworkActiv Web Server 4.0 Pre-Alpha-3.7.2 by sending an overly long username (11250 'A' characters) via the 'Set username' field, causing a denial of service (DoS). The exploit requires manual steps to trigger the crash, including pasting the payload into the application's GUI.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: NetworkActiv Web Server 4.0 Pre-Alpha-3.7.2
Auth required
Prerequisites: access to the application's GUI · ability to set username/password
devstral-2 · analyzed Apr 08, 2026 Full analysis →

References (4)

Core 4
Core References
Exploit exploit
ExploitDB-45302
https://www.exploit-db.com/exploits/45302
Product product
Official Product Homepage
https://www.networkactiv.com/WebServer.html
Product product
Product Reference
https://www.networkactiv.com/Dev/
Third Party Advisory third-party-advisory
VulnCheck Advisory: NetworkActiv Web Server 4.0 Username Field Buffer Overflow DoS
https://www.vulncheck.com/advisories/networkactiv-web-server-username-field-buffer-overflow-dos

Scores

CVSS v3 6.2
EPSS 0.0022
EPSS Percentile 12.4%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-787
Status published
Products (2)
Networkactiv/NetworkActiv Web Server 4.0 Pre-Alpha-3.7.2
networkactiv/web_server < 4.0
Published Mar 30, 2026
Tracked Since Mar 30, 2026