CVE-2025-53634: chall-manager DoS — Fix

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-770 CWE-770

Affected Products

Vendor	Product	Versions
ctfer-io	chall-manager	< 0.1.4

References

Advisories & Patches

https://github.com/ctfer-io/chall-manager/commit/1385bd869142651146cd0b123085f91cec698636 https://github.com/ctfer-io/chall-manager/security/advisories/GHSA-ggmv-j932-q89q

Other References

https://github.com/ctfer-io/chall-manager/releases/tag/v0.1.4

Frequently Asked Questions

What is CVE-2025-53634? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-53634? +

CVE-2025-53634 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-53634? +

CVE-2025-53634 affects products from ctfer-io, specifically: chall-manager. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-53634? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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