What is CVE-2018-25193?

CVE-2018-25193 is a high-severity vulnerability in Cesanta Mongoose Web Server, classified under Initialization of a Resource with an Insecure Default. CVSS score: 7.5/10. Published 2026-03-06.

How severe is CVE-2018-25193?

High severity. CVSS v3 base score is 7.5 out of 10.

RCE in Cesanta Mongoose Web Server

CVE-2018-25193

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.

Published 2026-03-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (26.6th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Cesanta Mongoose Web Server — versions 6.9

Weakness classification (CWE)

CWE-1188 — Initialization of a Resource with an Insecure Default

References

ExploitDB-45819 (exploit)
VulnCheck Advisory: Mongoose Web Server 6.9 Denial of Service via Socket Connection (third-party-advisory)

Frequently asked questions

What is CVE-2018-25193?: CVE-2018-25193 is a high-severity vulnerability in Cesanta Mongoose Web Server, classified under Initialization of a Resource with an Insecure Default. CVSS score: 7.5/10. Published 2026-03-06.
How severe is CVE-2018-25193?: High severity. CVSS v3 base score is 7.5 out of 10.