CVE-2018-25235 NetworkActiv Web Server 4.0 Username Field Buffer Overflow DoS
Local attackers can crash NetworkActiv Web Server by supplying an excessively long username string, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-25235?
CVE-2018-25235 is a medium-severity memory corruption vulnerability in NetworkActiv Web Server, published on 30 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-787
Which versions are affected by CVE-2018-25235?
It affects 1 product.
Products include Networkactiv Web Server.
How do I fix CVE-2018-25235?
No fix has been published for CVE-2018-25235 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2018-25235 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25235 exists.
Sources
Also known as GHSA-x4g8-cm9x-f937.