Advisory

On 08.07.2025 a security relevant correction has been released by SAP SE. The manufacturer resolves an issue within Java.

SAP Note 3621771 addresses "[CVE-2025-42963] Insecure Deserialization in SAP NetWeaver Application Server for Java (Log Viewer )" to prevent remote code execution vulnerability with a hot news risk for exploitation.

A workaround does exist, according to SAP Security Advisory team. It is advisable to implement the correction as monthly patch process, the team suggests.

Risk specification

SAP NetWeaver Application Server for Java Log Viewer contains an unsafe Java deserialization vulnerability that can be exploited by an authenticated attacker with administrative privileges, potentially leading to full control over the underlying operating system.

Solution

The vulnerable Log Viewer RM module has been removed to mitigate the Java deserialization vulnerability. Circumstances exist that prevent the timely installation of a patch provided by the manufacturer. In such cases, you may consider applying the suggested workaround as a temporary or compensating mitigation: "To reduce risk, you can temporarily disable the vulnerable LogViewer component by adding a startup filter. Use the following settings:You can add this filter through either the Config Tool or the NWA Java System Properties.1. Launch the Config Tool:Navigate to: <SAP_install_dir>/<system_name>/<instance_name>/j2ee/configtool and double-click the configtool script file.2. Go to View → Expert Mode.3. Select the relevant configuration template or instance where you want to apply the filter.4. Open the Filters section.5. In the Custom Rules pane:- Set Action to disable- Choose Component Type: all components- Set Vendor Mask: sap.com- Set Component Name Mask: tc~lm~itsam~ui~lv~*6. Click Add, then select the new entry and choose Set.7. Apply the changes and restart the system.Once the LogViewer application is disabled, logs can still be accessed via:- SAP Management Console (SAP MMC)- Directly from the file system".

Affected System

SAP Netweaver Application Server Java is part of the SAP NetWeaver Application Platform. It provides the complete infrastructure for deploying and running Java applications.

The AS Java Home: SAP Netweaver Application Server Java wiki
A dedicated SAP NetWeaver 7.40 Application Server for Java Security Guide exists.

The advisory is valid for

LMNWABASICAPPS 7.50 ²

Releated advisories

Disclaimer

SecurityBridge takes the security of SAP products very seriously. We very much encourage the responsible disclosure of security vulnerabilities. If you have detected a vulnerability concerning one of the SAP software products – either in the latest or in a former product version follow the guidelines and processes in accordance with the SAP portal page “Report a Security Vulnerability to SAP”.

The advisories found within the SecurityBridge advisory are generated and continuously enriched by our Team at SecurityBridge and affiliated security consultants, partners, customers of the SecurityBridge Platform, SAP support, and advisory groups.

We do not disclose zero-day vulnerabilities unless a security patch has been made available to the public. In such case, the platform only provides details on which version or signature updates are available within the SecurityBridge platform in order to monitor or measure the vulnerability.

In accordance with SAP guidelines, SecurityBridge only discloses issues where the fixing security note has been released. The vulnerability platform makes no references to available exploits or Proof of Concepts (PoC). Advisories and vulnerabilities will always mention the fixing security note or hints to the corresponding SAP documentation.

SecurityBridge^{for SAP©}
empowers security teams with forward-looking, high fidelity, adversary-focused intelligence and actionable events from SAP Netweaver based systems.

Follow @_securitybridge

Notifications

Affected system Java

CVSS 9.1

Component BC-JAS-ADM-LOG

Patch Day2025-07

Released on2025/07/08

SAP Note 3621771

Workaround Yes

Advisory

Risk specification

Solution

Affected System

Disclaimer

_{Affected system}
Java

_CVSS
9.1

_Component
BC-JAS-ADM-LOG

_{Patch Day}
2025-07

_{Released
on}
2025/07/08

_{SAP Note}
3621771

_Workaround
Yes