Home

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.

PUBLISHED Reserved 2026-03-30 | Published 2026-03-30 | Updated 2026-03-30 | Assigner VulnCheck




MEDIUM: 6.9CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
MEDIUM: 6.2CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

Out-of-bounds Write

Product status

4.0 Pre-Alpha-3.7.2
affected

Credits

Victor Mondragón finder

References

www.exploit-db.com/exploits/45302 (ExploitDB-45302) exploit

www.networkactiv.com/WebServer.html (Official Product Homepage) product

www.networkactiv.com/Dev/ (Product Reference) product

www.vulncheck.com/...rver-username-field-buffer-overflow-dos (VulnCheck Advisory: NetworkActiv Web Server 4.0 Username Field Buffer Overflow DoS) third-party-advisory

cve.org (CVE-2018-25235)

nvd.nist.gov (CVE-2018-25235)

Download JSON