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CVE-2018-20355
CRITICAL
An invalid write of 8 bytes due to a use-after-free vulnerability in the mg_http_free_proto_data_cgi function call 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.
Published: Jun 10, 2019
Modified: Jun 17, 2026
CWE-416
CVSS Metrics
CVSSv3
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products (1)
| Vendor | Product | Version |
|---|---|---|
| cesanta | mongoose | * |
GitHub Security Advisory GHSA-9q6r-hpgq-gfqm
An invalid write of 8 bytes due to a use-after-free vulnerability in the...
References (2)
- https://github.com/insi2304/mongoose-6.13-fuzz/blob/master/Simplest_Web_Server_Use_After_Free-mg_http_free_proto_data_cgi.png Exploit, Third Party Advisory
- https://github.com/insi2304/mongoose-6.13-fuzz/blob/master/Simplest_Web_Server_Use_After_Free-mg_http_free_proto_data_cgi.png Exploit, Third Party Advisory
Risk Scores
CVSS Score
9.8 / 10
EPSS Score
3.57%
Top 12% most likely to be exploited
Threat Score
40.3 / 100
Data Sources
NVD
EPSS
GitHub