Resource exhaustion in Apereo Cas
CVE-2025-3986
A vulnerability was found in Apereo CAS 5.2.6. It has been declared as problematic. This vulnerability affects unknown code of the file cas-5.2.6\core\cas-server-core-configuration-metadata-repository\src\main\java\org\apereo\cas\metadata\rest\CasConfigurationMetadataServerController.java. The manipulation of the argument Name leads to inefficient regular expression complexity. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.005 (42.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Apereo Cas — versions 5.2.6
- Apereo Central_authentication_service — versions 5.2.6
Weakness classification (CWE)
References
- cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry)
- cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
- cna@vuldb.com (exploit, Not Applicable)
Frequently asked questions
- What is CVE-2025-3986?
- CVE-2025-3986 is a medium-severity vulnerability in Apereo Cas, classified under Uncontrolled Resource Consumption. CVSS score: 4.3/10. Published 2025-04-27.
- How severe is CVE-2025-3986?
- Medium severity. CVSS v3 base score is 4.3 out of 10.