CVE-2025-53633CRITICAL 9.8EPSS p36.4%

CVE-2025-53633CVE-2025-53633

Description

Chall-Manager is a platform-agnostic system able to start Challenges on Demand of a player. When decoding a scenario (i.e. a zip archive), the size of the decoded content is not checked, potentially leading to zip bombs decompression. 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 14042aa and shipped in v0.1.4.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.46% probability of exploitation · percentile 36.4% · 2026-06-19T12:03:05Z
Published2025-07-10
Last modified2025-08-14

Underlying weaknesses· 1

CWE-405

References

  1. https://github.com/ctfer-io/chall-manager/commit/14042aa66a577caee777e10fe09adcf2587d20dd
  2. https://github.com/ctfer-io/chall-manager/releases/tag/v0.1.4
  3. https://github.com/ctfer-io/chall-manager/security/advisories/GHSA-r7fm-3pqm-ww5w

1

TypeTargetConfidenceTier
WeaknessAsymmetric Resource Consumption (Amplification)cwe-4050%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.