CVE-2023-51771

In MicroHttpServer (aka Micro HTTP Server) through a8ab029, _ParseHeader in lib/server.c allows a one-byte recv buffer overflow via a long URI

Critical · published December 25, 2023

CVSS v3.1
9.8
EPSS
1%
Percentile
52.7
In the wild
Unconfirmed
What it is

🔥 A single long URI is all it takes to trigger a dangerous buffer overflow in MicroHttpServer! Think of it like a water pipe that can only handle a certain amount of pressure; if you push too much water in at once, it bursts. In this case, the overflow could let attackers pop the lid off your server's defenses! The consequences could be absolutely devastating—attackers could potentially execute arbitrary code, gaining control over the server and leading to data breaches or service disruptions. Imagine someone bursting into your home and taking whatever they want without a second thought!

Put simply

Think of it like a water pipe that can only handle a certain amount of pressure; if you push too much water in at once, it bursts. In this case, the overflow could let attackers pop the lid off your server's defenses! This vulnerability, CVE-2023-51771, occurs in the _ParseHeader function within MicroHttpServer, where a one-byte recv buffer overflow allows overflow from excessively long URIs, leading to serious security vulnerabilities.

What to do

The consequences could be absolutely devastating—attackers could potentially execute arbitrary code, gaining control over the server and leading to data breaches or service disruptions. Imagine someone bursting into your home and taking whatever they want without a second thought! To keep your systems safe, patch MicroHttpServer to the latest version immediately. Review your configuration settings to ensure they’re secure, and consider implementing additional input validation measures to prevent long URIs from being processed. You've got this! Take these steps, and you'll lock down your server in no time! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00701 · 52.7th percentile
Published
2023-12-25T00:00Z
EPSS history
Timeline
  • 25 DEC 00:00Z
    In MicroHttpServer (aka Micro HTTP Server) through a8ab029, _ParseHeader in lib/server.c allows a one-byte recv buffer overflow via a long URI
    cvelistv5