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Fencer Vulns
medium 4.3

CVE-2021-21228 json

Insufficient policy enforcement in extensions in Google Chrome prior to 90.0.4430.93 allowed an attacker who convinced a user to install a…

published 2021-04-30 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8619

cvss
4.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

Insufficient policy enforcement in extensions in Google Chrome prior to 90.0.4430.93 allowed an attacker who convinced a user to install a malicious extension to bypass navigation restrictions via a crafted Chrome Extension.

Patch / fix

  • Google Chrome 90.0.4430.93
  • chromium Debian 14, Debian 13, Debian 12 90.0.4430.93-1

debian advisories DEBIAN-CVE-2021-21228

  • chromium-browser Ubuntu 18.04 LTS 90.0.4430.93-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2021-21228

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • chromium openSUSE Tumbleweed 93.0.4577.82-1.1
  • chromium openSUSE Tumbleweed 113.0.5672.92-1.1
  • opera openSUSE Leap 15.2 NonFree 76.0.4017.107-lp152.2.46.1
  • chromium openSUSE Leap 15.2 90.0.4430.93-lp152.2.89.1

opensuse advisories openSUSE-SU-2024:10681-1openSUSE-SU-2024:12948-1openSUSE-SU-2021:0729-1openSUSE-SU-2021:0629-1

  • vivaldi Arch Linux 3.8.2259.37-1
  • chromium Arch Linux 90.0.4430.93-1

arch linux advisories AVG-1828AVG-1871

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-2021-21228 updated cvss 6.5

chromium-browser: Insufficient policy enforcement in extensions

  • 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

1.06% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • Google Chrome

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns 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.