CVE-2021-29447
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 85.7%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 85.72% probability · 100th percentile
- Public exploits
- 1 in Exploit-DB · first 20 September 2021
- CISA KEV
- Not listed
- Weakness
- CWE-611
- Affected
- wordpress/wordpress · debian/debian linux
- Source
- security-advisories@github.com
EPSS 85.7% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.