Security Advisories

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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 11/21/2021 SAP Netweaver JAVA

XXE Vulnerability in SAP JAVA NetWeaver System Connections

Impact On Business

A high-privileged SAP JAVA NetWeaver user is able to abuse an XXE vulnerability with the goal of reading files from the OS (compromising confidentiality) and/or making system processes crash (compromising availability).

Affected Components Description

The ESP framework is a framework used inside SAP JAVA NetWeaver. Due to being part of this foundational layer, every SAP product based on JAVA NetWeaver will be vulnerable to this attack. This includes: SAP SolMan, SAP LaMa, SAP CRM,  just to mention a few.

Affected components:

  • ESP framework (SAP JAVA)

(Check SAP Note #3053066 for detailed information on affected releases)

Vulnerability Details

The Communication Profiles functionality provided within SAP JAVA NetWeaver, is vulnerable to XXE attacks. Due to the lack of validation of external entities, an authenticated attacker is able to submit specially crafted XML and compromise the integrity (by reading files of the OS) and the availability (by causing process to crash).



SAP has released SAP Note #3053066 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

  • 04/22/2021 - Onapsis sends details to SAP
  • 04/23/2021 - SAP provides internal tracking ID 2170134834
  • 04/26/2021 - SAP provides the following email:
  • 05/10/2021 - SAP provides update: Vulnerability being fixed
  • 06/08/2021 - SAP releases patch #3053066
  • 11/21/2021 - Advisory published



Advisory Information

  • Public Release Date: 11/21/2021
  • Security Advisory ID: ONAPSIS-2021-0016
  • Vulnerability Submission ID: 881
  • Researcher(s): Pablo Artuso

Vulnerability Information

  • Vendor: SAP
  • Vulnerability Class: |LS|CWE-611|RS| Improper Restriction of XML External Entity Reference
  • CVSS v3 score: 8.7 AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:H
  • Severity: High
  • CVE:  CVE-2021-27635
  • Vendor patch Information: SAP Security Note 3053066


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

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