CVE-2025-53634

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

Published Jul 10, 2025 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-21052 Chall-Manager's HTTP Gateway is vulnerable to DoS due to missing header timeout
Github GHSA Github GHSA GHSA-ggmv-j932-q89q Chall-Manager's HTTP Gateway is vulnerable to DoS due to missing header timeout
History
Type Values Removed Values Added
First Time appeared Ctfer-io
Ctfer-io chall-manager
CPEs cpe:2.3:a:ctfer-io:chall-manager:*:*:*:*:*:*:*:*
Vendors & Products Ctfer-io
Ctfer-io chall-manager
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
Metrics epss

{'score': 0.00095}

epss

{'score': 0.00113}

Type Values Removed Values Added
Metrics epss

{'score': 0.00095}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Chall-Manager's HTTP Gateway have no header check timeout leading to potential slow loris attacks
Weaknesses CWE-770
References
Metrics cvssV4_0

{'score': 8.7, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 10, 2025, 8:26 PM
Reserved
Jul 7, 2025, 2:20 PM
Status
Analyzed
Published
Jul 10, 2025, 8:15 PM
Modified
Jun 17, 2026, 9:38 AM