What’s Vulnerable › Vulnerabilities

CVE-2018-25235: NetworkActiv Web Server 4.0 Username Field Buffer Overflow DoS

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-30 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• NetworkActiv Web Server: before 4.0 — fixed in 4.0

How to fix

Upgrade to a fixed version: NetworkActiv Web Server 4.0. Check the vendor advisory for mitigations.

References

• https://www.exploit-db.com/exploits/45302
• https://www.networkactiv.com/Dev/
• https://www.networkactiv.com/WebServer.html
• https://www.vulncheck.com/advisories/networkactiv-web-server-username-field-buffer-overflow-dos

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