CVE-2021-38555

Name: CVE-2021-38555
Creator: NVD / NIST
Published: 2021-09-11T11:15:08.223+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 2.66%

Last modified Jun 17, 2026

CVE-2021-38555 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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. EPSS estimates a 2.66% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

2.66%

83.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-611

Affected Software

Vendor	Product	Versions
Apache	Any23	< 2.5

References

https://lists.apache.org/thread.html/r589d1a9f94dbeee7a0f5dbe8513a0e300dfe669bd964ba2fbfe28e07%40%3Cannounce.apache.org%3EMailing List, Vendor Advisory
https://lists.apache.org/thread.html/r589d1a9f94dbeee7a0f5dbe8513a0e300dfe669bd964ba2fbfe28e07%40%3Cannounce.apache.org%3EMailing List, Vendor Advisory

Timeline

Published: Sep 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-38555?

How severe is CVE-2021-38555?

CVE-2021-38555 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 2.66% probability of exploitation in the next 30 days.

How do I fix CVE-2021-38555?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-38555?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST