Vulnerability in WordPress
CVE-2021-44223
WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.290 (98.1th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.290 · newest: 0.290 · change: 0.000
Affected products
Public proof-of-concept exploits
References
- vavkamil.cz/2021/11/25/wordpress-plugin-confusion-update-can-get-you-pwned/ (Exploit, Third Party Advisory)
- make.wordpress.org/core/2021/06/29/introducing-update-uri-plugin-header-in-word… (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-44223?
- CVE-2021-44223 is a high-severity vulnerability in WordPress. CVSS score: 8.1/10. Published 2021-11-25.
- How severe is CVE-2021-44223?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2021-44223 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.