Overview
The CVE-2025-42963 is a critical vulnerability discovered in the SAP NetWeaver Application server for Java Log Viewer. This vulnerability poses a significant threat as it enables authenticated administrator users to exploit unsafe Java object deserialization. The severity of this vulnerability lies in its potential to provide attackers complete control over the affected system, leading to full operating system compromise. This can severely impact the confidentiality, integrity, and availability of the application and host environment, affecting any business or individual relying on the SAP NetWeaver Application server for their operations.
Vulnerability Summary
CVE ID: CVE-2025-42963
Severity: Critical (CVSS: 9.1)
Attack Vector: Network
Privileges Required: Administrator
User Interaction: Required
Impact: System compromise, potential data leakage
Affected Products
Escape the Surveillance Era
Most apps won’t tell you the truth.
They’re part of the problem.
Phone numbers. Emails. Profiles. Logs.
It’s all fuel for surveillance.
Ameeba Chat gives you a way out.
- • No phone number
- • No email
- • No personal info
- • Anonymous aliases
- • End-to-end encrypted
Chat without a trace.
Product | Affected Versions
SAP NetWeaver Application Server for Java | All versions prior to patch
How the Exploit Works
The vulnerability exploits the unsafe deserialization of Java objects in SAP NetWeaver Application Server’s Log Viewer. An authenticated administrator user can pass a specially crafted object to the vulnerable Log Viewer. This object, when deserialized, can execute arbitrary code, leading to complete control over the system.
Conceptual Example Code
Here is a conceptual example of how the vulnerability might be exploited. An attacker might send a POST request with a malicious payload to the Log Viewer:
POST /LogViewer/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"malicious_object": "base64_encoded_serialized_java_object"
}In this example, `base64_encoded_serialized_java_object` represents a serialized Java object carrying malicious code for execution upon deserialization.
Mitigation Measures
The recommended mitigation measure for this vulnerability is to apply the vendor patch as soon as it becomes available. As an immediate temporary mitigation, one can use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to detect and block attempts to exploit this vulnerability. However, these measures may not completely prevent exploitation and are not substitutes for patching the affected system.