CVE-2021-29447

Name: CVE-2021-29447
Creator: NVD / NIST
Published: 2021-04-15T21:15:17.723+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 85.72%

Last modified Jun 17, 2026

CVE-2021-29447 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 85.72% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

85.72%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Wordpress	Wordpress	>= 5.6.0, < 5.7.1
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0

References

http://packetstormsecurity.com/files/163148/XML-External-Entity-Via-MP3-File-Upload-On-WordPress.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/164198/WordPress-5.7-Media-Library-XML-Injection.htmlExploit, Third Party Advisory, VDB Entry
https://blog.sonarsource.com/wordpress-xxe-security-vulnerability/Exploit, Third Party Advisory
https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-rv47-pc52-qrhhThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00017.htmlMailing List, Third Party Advisory
https://wordpress.org/news/category/security/Release Notes, Vendor Advisory
https://www.debian.org/security/2021/dsa-4896Third Party Advisory
http://packetstormsecurity.com/files/163148/XML-External-Entity-Via-MP3-File-Upload-On-WordPress.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/164198/WordPress-5.7-Media-Library-XML-Injection.htmlExploit, Third Party Advisory, VDB Entry
https://blog.sonarsource.com/wordpress-xxe-security-vulnerability/Exploit, Third Party Advisory
https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-rv47-pc52-qrhhThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00017.htmlMailing List, Third Party Advisory
https://wordpress.org/news/category/security/Release Notes, Vendor Advisory
https://www.debian.org/security/2021/dsa-4896Third Party Advisory

Timeline

Published: Apr 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-29447?

How severe is CVE-2021-29447?

CVE-2021-29447 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 85.72% probability of exploitation in the next 30 days.

How do I fix CVE-2021-29447?

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-2021-29447?

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

Scan your code now

Source: NVD / NIST