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Fencer Intel
high 8.1

CVE-2021-44223 in the critical feed json

WordPress before 5.8 lacks support for the Update URI plugin header.

published 4y ago modified 2mo ago also BIT-wordpress-2021-44223 , BIT-wordpress-multisite-2021-44223 , EUVD-2021-31072

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
29.0%
EPSS 29.0% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

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.

Patch / fix

  • bitnami wordpress 5.8.0
  • bitnami wordpress-multisite 5.8.0
  • wordpress wordpress 5.8
  • wordpress Debian 14, Debian 13, Debian 12 5.8.1+dfsg1-1

debian advisories DEBIAN-CVE-2021-44223

Is CVE-2021-44223 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-44223 updated cvss 8.1

wordpress: remote code execution via a supply-chain attack

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

28.98% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • vavkamil.cz https://vavkamil.cz/2021/11/25/wordpress-plugin-confusion-update-can-get-you-pwned/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AC:H/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
bitnami wordpress
<5.8.0
5.8.0
bitnami wordpress-multisite
<5.8.0
5.8.0

Classification

Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.