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Fencer Intel
medium 6.5

CVE-2021-30533 kev in the critical feed json

Insufficient policy enforcement in PopupBlocker in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass navigation restr…

published 5y ago modified 4mo ago also EUVD-2021-17454

cvss
6.5
version 3.1, CNA
cisa kev
Exploited
added 2022-06-27
epss
16.7%
EPSS 16.7% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

Insufficient policy enforcement in PopupBlocker in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass navigation restrictions via a crafted iframe.

Patch / fix

cisa required action Apply updates per vendor instructions.

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

debian advisories DEBIAN-CVE-2021-30533

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

ubuntu advisories UBUNTU-CVE-2021-30533

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
  • qt5-qtwebengine Alpine 3.14 5.15.3_git20211006-r0
  • qt5-qtwebengine Alpine 3.23, Alpine 3.22, Alpine 3.21 +6 more 5.15.3_git20210510-r4

alpine advisories ALPINE-CVE-2021-30533

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

Is CVE-2021-30533 in your stack? 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-2021-30533 updated cvss 6.5

chromium-browser: Insufficient policy enforcement in PopupBlocker

  • 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

Timeline

  1. Published
  2. Added to CISA KEV
  3. CISA patch deadline
  4. CISA SSVC: exploitation active

Known exploited

Added
4y ago
Patch by
2022-07-18 (4y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Google, Chromium PopupBlocker
CISA name
Google Chromium PopupBlocker Security Bypass Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

16.74% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • crbug.com https://crbug.com/1145553 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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 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.