CVE-2025-53634: high-severity vulnerability in ctfer-io chall-manager
Chall-Manager's HTTP Gateway have no header check timeout leading to potential slow loris attacks
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.5%
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.
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
Affected products
ctfer-io · chall-managerRelated CVEs — ctfer-io chall-manager
In the same product, most dangerous first.
CVE-2025-53632HIGHChall-Manager's scenario decoding process does not check for zip slipsEPSS 0.8%CVE-2025-53633HIGHChall-Manager's scenario decoding process does not check for zip bombsEPSS 0.5%CVE-2026-32768HIGHChall-Manager's invalid NetworkPolicy enables a malicious actor to pivot into another namespaceEPSS 0.3%