CVE-2025-53633Network attack vector

Unauthenticated service interruption via unbounded scenario decompression

Published Jul 10, 2025 · Updated Jul 10, 2025

Resource exhaustion in CTFer.io Chall-Manager before 0.1.4 allows remote attackers to interrupt service via a crafted scenario archive. The scenario Decode path base64-decodes a supplied ZIP and writes every entry without limiting the aggregate expanded byte count. No authentication or user interaction is required, but the API is intended to remain inside trusted infrastructure rather than exposed to users.

CVSS severity8.7
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in CTFer.io Chall-Manager before 0.1.4 allows remote attackers to interrupt service via a crafted scenario archive. The scenario Decode path base64-decodes a supplied ZIP and writes every entry without limiting the aggregate expanded byte count. No authentication or user interaction is required, but the API is intended to remain inside trusted infrastructure rather than exposed to users.

The record

CVE
CVE-2025-53633
Published
Jul 10, 2025
Updated
Jul 10, 2025
Vendor
CTFer.io
Product
Chall-Manager
Classifications
CWE-405, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CTFer.io · Chall-Managerversion=< 0.1.4

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.7GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-405Asymmetric Resource Consumption (Amplification)
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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