Security Advisories

The Onapsis Research Labs delivers regular SAP® and Oracle® vulnerability research to our ecosystem of customers, partners and the information security industry.

Onapsis security advisories enable customers to better understand the security and business implications of discovered SAP and Oracle security issues. This enables organizations to prioritize patches, updates and their remediation strategies to ensure continuity of the business. Onapsis security advisories, together with vendor patches and security notes, are available for download to provide vendors and end-users with the necessary information to mitigate advanced threats to mission-critical applications running on SAP and Oracle.

High 04/05/2022 SAP Netweaver JAVA

Denial of Service in SAP NetWeaver JAVA

Impact On Business

This vulnerability can be used by an attacker to make a Denial of Service to SAP Netweaver Java, making HTTP server unavailable during attack execution.

Affected Components Description

One of the principal entry points in all SAP Application Server Java is the HTTP Web Server. As part of this service there are many standard components analyzing and preprocessing the data sent to and received from the users. Because these components are in a critical place, vulnerabilities on them are really serious and affect all NetWeaver JAVA based SAP Products.

Vulnerability Details

SAP Netweaver Java has a stack of standard J2EE filters responsable to do some controls and statistical operations over each received request. The vulnerability exists because one of those filters is keeping information about the different HTTP methods received by the server, but it is not properly controlling how much memory it needs to store that information. After sending a specially crafted request, an attacker is able to make that filter raise an OutOfMemoryError, making the virtual machine crash.



SAP has released SAP Note 3056652 which provides patched versions of the affected components.

The patches can be downloaded from 

Onapsis strongly recommends SAP customers to download the related security fixes and apply them to the affected components in order to reduce business risks.

Report Timeline

  • 04-26-2021 - Onapsis provides details to SAP
  • 04-29-2021 - SAP Provides a tracking number
  • 05-10-2021 - SAP provides update: Vulnerability being fixed
  • 07-12-2021 - SAP release patch #3056652
  • 05-04-2022 - Advisory Published



Advisory Information

  • Public Release Date: 04/05/2022
  • Security Advisory ID: ONAPSIS-2022-0002
  • Vulnerability Submission ID: 882
  • Researcher(s): Gaston Traberg

Vulnerability Information

  • Vendor: SAP
  • Vulnerability Class: |LS|CWE-400|RS| Uncontrolled Resource Consumption
  • CVSS v3 score: 7.5 V:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • Severity: High
  • CVE: CVE-2021-33670
  • Vendor patch Information: SAP Security Note 3056652


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and experience to deliver technical and business-context with sound security judgment to the broader information security community.

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This advisory is licensed under a Creative Commons 4.0 BY-ND International License

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