Vulnerability · Published Jul 10, 2025 · Assigned by GitHub_M
CVE-2025-53634Chall-Manager's HTTP Gateway have no header check timeout leading to potential slow loris attacks
High 8.7
In plain English
A high-severity resource allocation without limits in chall-manager from ctfer-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/ctfer-io/chall-manager | 0.1.4 | GHSA-ggmv-j932-q89q |
| Go | github.com/ctfer-io/chall-manager | 0.1.4 | GO-2025-3809 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ctfer-io | chall-manager | < 0.1.4 |
Weakness: CWE-770 · 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