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Vulnerability details: VCID-zhu9-kz2j-t7eg
Vulnerability ID VCID-zhu9-kz2j-t7eg
Aliases CVE-2021-44223
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 8.8
Risk 4.4
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.21463 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.21463 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.2382 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.2382 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.2382 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.2382 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.2382 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.2382 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.2382 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.2382 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.2382 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.2382 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.33306 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
epss 0.39049 https://api.first.org/data/v1/epss?cve=CVE-2021-44223
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-44223
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2021-44223
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-44223
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44223
https://make.wordpress.org/core/2021/06/29/introducing-update-uri-plugin-header-in-wordpress-5-8/
https://vavkamil.cz/2021/11/25/wordpress-plugin-confusion-update-can-get-you-pwned/
cpe:2.3:a:wordpress:wordpress:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:wordpress:wordpress:*:*:*:*:*:*:*:*
CVE-2021-44223 https://nvd.nist.gov/vuln/detail/CVE-2021-44223
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-44223
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-44223
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.95501
EPSS Score 0.21463
Published At Aug. 2, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T12:22:05.843023+00:00 EPSS Importer Import https://epss.cyentia.com/epss_scores-current.csv.gz 37.0.0