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CVE-2021-29447

7.1 · HIGH

Wordpress is an open source CMS.

Published Apr 15, 2021CWE-611EPSS 85.72%

Overview

CVE-2021-29447 is a high-severity vulnerability. It was published on April 15, 2021 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Wordpress is an open source CMS. A user with the ability to upload files (like an Author) can exploit an XML parsing issue in the Media Library leading to XXE attacks. This requires WordPress installation to be using PHP 8. Access to internal files is possible in a successful XXE attack. This has been patched in WordPress version 5.7.1, along with the older affected versions via a minor release. We strongly recommend you keep auto-updates enabled.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/163148/XML-External-Entity-Via-MP3-File-Upload-On-WordPress.htmlRefpacketstormsecurity.com/files/164198/WordPress-5.7-Media-Library-XML-Injection.htmlRefblog.sonarsource.com/wordpress-xxe-security-vulnerability/GitHubgithub.com/WordPress/wordpress-develop/security/advisories/GHSA-rv47-pc52-qrhhReflists.debian.org/debian-lts-announce/2021/04/msg00017.htmlRefwordpress.org/news/category/security/Refwww.debian.org/security/2021/dsa-4896Refpacketstormsecurity.com/files/163148/XML-External-Entity-Via-MP3-File-Upload-On-WordPress.htmlRefpacketstormsecurity.com/files/164198/WordPress-5.7-Media-Library-XML-Injection.htmlRefblog.sonarsource.com/wordpress-xxe-security-vulnerability/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-29447?

CVE-2021-29447 is a high-severity vulnerability. It was published on April 15, 2021 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2021-29447?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-29447?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-29447?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-29447 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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