CVE-2025-53634 HIGH

CVE-2025-53634: Chall-Manager's HTTP Gateway have no header check timeout leading to potential slow loris attacks

Vendor Ctfer-Io
Product chall-manager
Weakness CWE-770 · Uncontrolled resource consumption
Published July 10, 2025
Last update July 10, 2025

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

Chall-Manager is a platform-agnostic system able to start Challenges on Demand of a player. The HTTP Gateway processes headers, but with no timeout set. With a slow loris attack, an attacker could cause Denial of Service (DoS). Exploitation does not require authentication nor authorization, so anyone can exploit it. It should nonetheless not be exploitable as it is highly recommended to bury Chall-Manager deep within the infrastructure due to its large capabilities, so no users could reach the system. Patch has been implemented by commit 1385bd8 and shipped in v0.1.4.

Key dates

02Disclosure timeline

July 10, 2025 CVE published
July 10, 2025 Record updated