CVE-2018-20355 Use after free in n/a

Critical 9.8 Published 10 Jun 2019 Updated 5 Aug 2024

A use-after-free vulnerability in the Mongoose embedded web server library allows attackers to cause a crash or execute arbitrary code.

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-2018-20355?

CVE-2018-20355 is a critical use after free vulnerability in Cesanta Mongoose, published on 10 Jun 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-416

Which versions are affected by CVE-2018-20355?

It affects 1 product.

Products include Cesanta Mongoose.

How do I fix CVE-2018-20355?

No fix has been published for CVE-2018-20355 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2018-20355 being exploited?

There is no known exploitation of CVE-2018-20355 in the wild and no public exploit code.

All Cesanta Mongoose vulnerabilities

Sources

Also known as GHSA-9q6r-hpgq-gfqm.