CVE-2025-63653

An out-of-bounds read in the mk_vhost_fdt_close function (mk_server/mk_vhost.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS)…

High · published January 29, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
68.2
In the wild
Unconfirmed
What it is

⚡ An out-of-bounds read is the sneaky villain behind this vulnerability, allowing crafted HTTP requests to pull the rug right from under your server! 🔥 Think of it like a restaurant that serves food with a hidden menu — if a diner knows the right trick, they can order a dish that causes the kitchen to run wild, leading to a chaotic dining experience for everyone. The server can get overwhelmed, just like your service does in a Denial of Service (DoS) attack! An attacker can exploit this vulnerability to send a crafted HTTP request, potentially overwhelming the server and causing it to crash. This can lead to interrupted service, affecting all users trying to access your application — and we all know how frustrating that can be!

Put simply

Think of it like a restaurant that serves food with a hidden menu — if a diner knows the right trick, they can order a dish that causes the kitchen to run wild, leading to a chaotic dining experience for everyone. The server can get overwhelmed, just like your service does in a Denial of Service (DoS) attack! This vulnerability resides in the mk_vhost_fdt_close function of the Monkey server, where an out-of-bounds read can be triggered by specially crafted requests, leading to unexpected behavior or a complete service outage.

What to do

An attacker can exploit this vulnerability to send a crafted HTTP request, potentially overwhelming the server and causing it to crash. This can lead to interrupted service, affecting all users trying to access your application — and we all know how frustrating that can be! To mitigate this issue, update the Monkey server to the latest version where this vulnerability is patched. Regularly review your server configurations and implement rate limiting to reduce the risk of such attacks in the future. 🛡️ You've got this! With these steps, you can lock down your server and keep the chaos at bay! 🚀

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.01211 · 68.2th percentile
Published
2026-01-29T00:00Z
EPSS history
Timeline
  • 29 JAN 00:00Z
    An out-of-bounds read in the mk_vhost_fdt_close function (mk_server/mk_vhost.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS)…
    cvelistv5