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Vulnerabilities

Security fix · CVE-2025-53634

Chall-Manager is a platform-agnostic system able to start Challenges on Demand of a player.

Published Jul 10, 2025 · catalog updated Jul 10, 2025 · Chall-Manager is a platform-agnostic

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-53634. EPSS is 0.51%. Act only if a listed version of Chall-Manager is a platform-agnostic is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Chall-Manager is a platform-agnostic).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.51%
Remediation
Version ranges on file
Affected products
vendor ctfer-io chall-manager < 0.1.4

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor ctfer-io chall-manager < 0.1.4< 0.1.4

How to fix CVE-2025-53634

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-53634. EPSS is 0.51%. Act only if a listed version of Chall-Manager is a platform-agnostic is installed.

Which versions are affected?

Compare what you have installed with ctfer-io chall-manager < 0.1.4 < 0.1.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.51%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 10, 2025 · EUVD

    Detected

    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

  2. Jul 10, 2025 · EUVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2025-53634

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-53634

    30-day exploitation probability 0.51%

    first.org
  • EUVDVulnerability recordEUVD-2025-21052

    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 aut

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 19, 2026