CVE-2021-38555: An XML external entity (XXE) injection vulnerability exists in Apache Any23 StreamUtils.java

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-09-11 · updated 2026-06-17
Weakness: CWE-611

Description

An XML external entity (XXE) injection vulnerability was discovered in the Any23 StreamUtils.java file and is known to affect Any23 versions < 2.5. XML external entity injection (also known as XXE) is a web security vulnerability that allows an attacker to interfere with an application's processing of XML data. It often allows an attacker to view files on the application server filesystem, and to interact with any back-end or external systems that the application itself can access.

Affected products

Apache Software Foundation Apache Any23: before 2.5 — fixed in 2.5

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Any23 2.5. Check the vendor advisory for mitigations.

References

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