CVE-2018-25193 Mongoose Web Server 6.9 Denial of Service via Socket Connection
Remote attackers can crash the Mongoose Web Server by establishing multiple socket connections and sending malformed data, causing service unavailability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-25193?
CVE-2018-25193 is a high-severity denial of service vulnerability in Cesanta Mongoose Web Server, published on 6 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Mongoose Web Server 6.9 contains a denial of service vulnerability that allows remote attackers to crash the service by establishing multiple socket connections. Attackers can repeatedly create connections to the default port and send malformed data to exhaust server resources and cause service unavailability.
Weakness: CWE-1188
Which versions are affected by CVE-2018-25193?
How do I fix CVE-2018-25193?
No fix has been published for CVE-2018-25193 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2018-25193 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25193 exists.
Sources
Also known as GHSA-hm6q-f5fc-rh9v.