# CVE-2025-53633

## Summary

- **CVE ID:** CVE-2025-53633
- **Severity:** HIGH
- **CVSS Score:** 8.7 (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)
- **CWE:** CWE-405
- **Published:** Jul 10, 2025
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- ctfer-io — chall-manager (< 0.1.4)

## References

- [CNA](https://github.com/ctfer-io/chall-manager/security/advisories/GHSA-r7fm-3pqm-ww5w)
- [CNA](https://github.com/ctfer-io/chall-manager/commit/14042aa66a577caee777e10fe09adcf2587d20dd)
- [CNA](https://github.com/ctfer-io/chall-manager/releases/tag/v0.1.4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.48%
- **EPSS Percentile:** 39.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._