CVE-2025-63657

An out-of-bounds read in the mk_mimetype_find function (mk_server/mk_mimetype.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

⚡ A single crafted HTTP request is all it takes to trigger a Denial of Service! This out-of-bounds read in the mk_mimetype_find function is quietly waiting to wreak havoc on your server. 🔥 Imagine a delivery driver accidentally dropping off a package at the wrong address while the intended recipient is left waiting. This vulnerability acts similarly, allowing attackers to send a specially crafted request that disrupts the server's ability to function properly, causing a service breakdown. An attacker could cause your server to become unresponsive, leaving users unable to access vital services. This disruption could lead to lost revenue, frustrated customers, and a tarnished reputation as your server grinds to a halt under the pressure of malicious requests.

Put simply

Imagine a delivery driver accidentally dropping off a package at the wrong address while the intended recipient is left waiting. This vulnerability acts similarly, allowing attackers to send a specially crafted request that disrupts the server's ability to function properly, causing a service breakdown. The vulnerability in mk_mimetype_find allows for an out-of-bounds read, which can be exploited by sending a maliciously crafted HTTP request to the server, leading to performance issues and potential downtime.

What to do

An attacker could cause your server to become unresponsive, leaving users unable to access vital services. This disruption could lead to lost revenue, frustrated customers, and a tarnished reputation as your server grinds to a halt under the pressure of malicious requests. To address this vulnerability, update to the latest version of Monkey that contains the fix for this out-of-bounds read. In addition, consider implementing rate limiting to mitigate the impact of potential DoS attacks. Regularly review your server's configurations and logs to detect unauthorized or malicious requests. You've got this! With the right steps, you can keep your server running smoothly and secure. 🛡️

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_mimetype_find function (mk_server/mk_mimetype.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS)…
    cvelistv5