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Vulnerability record · CVE-2018-20352 · published 10 June 2019

CVE-2018-20352: Cesanta mongoose embedded web server library use after free vulnerability

Cesanta · Mongoose Embedded Web Server Library

Use-after-free vulnerability in the mg_cgi_ev_handler function in mongoose.c in Cesanta Mongoose Embedded Web Server Library 6.13 and earlier allows a denial of service (application crash) or remote code execution.

8.8 CVSS 3.0 High EPSS 2.7% · top 14.5% CWE-416 · Use after free
8.8CVSS 3.0 base score, v2 6.8
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Use-after-free vulnerability in the mg_cgi_ev_handler function in mongoose.c in Cesanta Mongoose Embedded Web Server Library 6.13 and earlier allows a denial of service (application crash) or remote code execution.

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/insi2304/mongoose-6.13-fuzz ExploitThird Party Advisory
https://github.com/insi2304/mongoose-6.13-fuzz ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-20352), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.