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Fencer Vulns
medium 4.3

CVE-2021-30538 json

Insufficient policy enforcement in content security policy in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass conte…

published 2021-06-07 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-17459

cvss
4.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
15.7%
EPSS 15.7% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

Insufficient policy enforcement in content security policy in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page.

Patch / fix

  • Google Chrome 91.0.4472.77
  • chromium Debian 14, Debian 13, Debian 12 93.0.4577.82-1

debian advisories DEBIAN-CVE-2021-30538

  • chromium-browser Ubuntu 18.04 LTS 91.0.4472.77-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2021-30538

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
  • chromium Package Hub 15 SP3, openSUSE Leap 15.3 91.0.4472.77-bp153.2.3.1
  • chromium openSUSE Leap 15.2 91.0.4472.77-lp152.2.98.1

opensuse advisories openSUSE-SU-2024:10681-1openSUSE-SU-2024:12948-1openSUSE-SU-2021:0840-1openSUSE-SU-2021:0825-1

  • chromium Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 91.0.4472.77-r0

alpine advisories ALPINE-CVE-2021-30538

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • chromium Arch Linux 91.0.4472.77-1
  • vivaldi Arch Linux 4.0.2312.24-1

arch linux advisories AVG-1990AVG-1991

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-2021-30538 updated cvss 4.3

chromium-browser: Insufficient policy enforcement in content security policy

  • 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

15.73% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • crbug.com https://crbug.com/1115045 referenced PoC, tagged "exploit" by a source, unverified

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.