Central Authentication Service
CVE-2025-3986
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V2 - Validation and Business Logic Resource consumption limits
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 5.3 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required. EPSS exploitation probability: 0.59%. |
| Exploit ScenarioDerived | A remote attacker could cause denial of service by exhausting system resources by sending crafted requests to the affected application. |
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Alert meAnalysisAIv1 – Mar 28, 2026
A vulnerability was found in Apereo CAS 5.2.6. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement rate limiting, set resource quotas, validate input sizes, use timeouts.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in maven
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Uncontrolled Resource Consumption (CWE-400), which allows attackers to cause denial of service by exhausting system resources. 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. Affected products include: Apereo Central Authentication Service.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionCVE.org
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.
Executive ViewAI
Organizations using A vulnerability should be aware of moderate risk from CVE-2025-3986, a resource exhaustion vulnerability rated CVSS 5.3. Service availability could be impacted. Organizations should apply vendor updates when available and monitor for exploitation.
Apply vendor patch. If patching is delayed: implement rate limiting and resource quotas.
Threat Intelligence Overview
NVD
CVE.org
EPSS
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)CVE.org
The does not validate a parameter before making a request to it, which could allow unauthenticated users to perform SSRF
Multiple classes used within Apereo CAS before release 6.1.0-RC5 makes use of apache commons-lang3 RandomStringUtils for
Apereo Central Authentication Service (CAS) Server before 3.5.3 allows remote attackers to conduct LDAP injection attack
A vulnerability was found in Apereo CAS 6.6 and classified as problematic. Rated medium severity (CVSS 6.3), this vulner
Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints. Rated medium severity (CVSS 6.1),
Improper Authentication vulnerability in Apereo CAS in jakarta.servlet.http.HttpServletRequest.getRemoteAddr method allo
A vulnerability was found in Apereo CAS 6.6. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitabl
A vulnerability has been found in Apereo CAS 6.6 and classified as problematic. Rated medium severity (CVSS 5.3), this v
Apereo CAS is an open source multilingual single sign-on solution for the web. Rated high severity (CVSS 7.5), this vuln
Apereo CAS 5.3.x before 5.3.16, 6.x before 6.1.7.2, 6.2.x before 6.2.4, and 6.3.x before 6.3.0-RC4 mishandles secret key
A vulnerability was found in Apereo CAS 5.2.6. Rated medium severity (CVSS 5.1), this vulnerability is remotely exploita
A vulnerability was found in Apereo CAS 5.2.6 and classified as critical. Rated low severity (CVSS 2.3), this vulnerabil
GitHub PoC
Exploit-DB