Overview
CVE-2025-21535 is a critical vulnerability impacting Oracle WebLogic Server, part of Oracle Fusion Middleware. The flaw allows unauthenticated attackers with network access via T3 or IIOP protocols to fully compromise vulnerable systems without user interaction.
Technical Details
This vulnerability resides in the Core component of WebLogic Server and is categorized under CWE-306: Missing Authentication for Critical Function. The issue enables attackers to send specially crafted requests to execute arbitrary operations on the server, resulting in complete system takeover.
The attack does not require credentials or any user interaction. Exploitation is possible over the network, making this vulnerability especially dangerous in exposed environments or misconfigured systems.
CVSS Score and Severity
The vulnerability has been assigned a CVSS v3.1 score of 9.8 (Critical). The vector string is:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact: High on confidentiality, integrity, and availability
Affected Versions
- Oracle WebLogic Server 12.2.1.4.0
- Oracle WebLogic Server 14.1.1.0.0
Both versions are vulnerable and require immediate remediation.
Mitigation and Recommendations
- Apply the patches provided in Oracle’s January 2025 Critical Patch Update (CPU) without delay.
- Restrict external access to T3 and IIOP protocols at the network perimeter.
- Monitor logs for signs of unauthorized access or suspicious activity targeting WebLogic services.
Conclusion
CVE-2025-21535 represents a highly exploitable vulnerability with the potential for full remote takeover of WebLogic Server instances. Given the critical nature of this flaw and its network accessibility, organizations using the affected versions must act urgently to secure their systems.
For more information, consult the official Oracle advisory: Oracle CPU January 2025
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