ReDoS Vulnerability in Apereo CAS 5.2.6 Affects Configuration Metadata Server
CVE-2025-3986

5.3MEDIUM

Key Information:

Vendor

Apereo

Status
Cas
Vendor
CVE Published:
27 April 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-3986?

A vulnerability exists in Apereo CAS version 5.2.6 due to inefficient regular expression complexity within the cas-server-core-configuration-metadata-repository component. Attackers can manipulate the argument Name to trigger this flaw remotely, potentially leading to denial of service conditions. The issue, which has been publicly disclosed, poses a significant risk given that it can be exploited without any special permissions. The vendor was informed of this vulnerability but has not responded to the disclosure.

Affected Version(s)

CAS 5.2.6

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-3986 - Proof of Concept

References

https://vuldb.com/?id.306322
vdb-entrytechnical-description
https://vuldb.com/?ctiid.306322
signaturepermissions-required
https://vuldb.com/?submit.557473
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

caichaoxiong (VulDB User)
.