PT-2026-5333 · M-Server · M-Server

Published 2026-01-29 · Updated 2026-02-19 · CVE-2025-63649

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions monkey commit f37e984

Description An out-of-bounds read exists in the http parser transfer encoding chunked function located in mk server/mk http parser.c. This flaw allows attackers to potentially cause a Denial of Service (DoS) by sending a specially crafted POST request to the server. The vulnerable function is http parser transfer encoding chunked().

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2025-63649

Affected Products

M-Server

References · 7

• 🔥 https://github.com/monkey/monkey/issues/426 · Exploit
• 🔥 https://github.com/archersec/security-advisories/blob/master/monkey/monkey-advisory-2025.md · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-63649 · Security Note
• https://osv.dev/vulnerability/CVE-2025-63649 · Vendor Advisory
• https://twitter.com/CVEnew/status/2016970901363831003 · Twitter Post
• https://t.me/cveNotify/152514 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2017003933235875924 · Twitter Post