CVE-2021-27635 XML external entity in SAP NetWeaver AS for JAVA

Critical 9.0 Published 9 Jun 2021 Updated 3 Aug 2024

An authenticated administrator can exploit missing XML validation to read arbitrary files or crash the system via a crafted XML file.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-27635?

CVE-2021-27635 is a critical vulnerability in SAP NetWeaver AS for JAVA, published on 9 Jun 2021. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

SAP NetWeaver AS for JAVA, versions - 7.20, 7.30, 7.31, 7.40, 7.50, allows an attacker authenticated as an administrator to connect over a network and submit a specially crafted XML file in the application because of missing XML Validation, this vulnerability enables attacker to fully compromise confidentiality by allowing them to read any file on the filesystem or fully compromise availability by causing the system to crash. The attack cannot be used to change any data so that there is no compromise as to integrity.

Weakness: CWE-611

Which versions are affected by CVE-2021-27635?

It affects 1 product.

Products include Sap Netweaver Application Server for Java.

How do I fix CVE-2021-27635?

No fix has been published for CVE-2021-27635 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-27635 being exploited?

There is no known exploitation of CVE-2021-27635 in the wild and no public exploit code.

Sources

Also known as GHSA-353p-c73g-8fwc.