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Fencer Vulns
high 8.8

CVE-2021-21220 kev in the critical feed json

Insufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit h…

published 2021-04-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8611

cvss
8.8
version 3.1, CNA
cisa kev
Exploited
added 2021-11-03
epss
70.4%
EPSS 70.4% chance of exploitation in 30 days, percentile 99.3%
public exploits
1
Metasploit

Summary

Insufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Patch / fix

cisa required action Apply updates per vendor instructions.

  • Google Chrome 89.0.4389.128
  • chromium Debian 14, Debian 13, Debian 12 90.0.4430.72-1

debian advisories DEBIAN-CVE-2021-21220

  • chromium-browser Ubuntu 16.04 LTS 90.0.4430.72-0ubuntu0.16.04.1
  • chromium-browser Ubuntu 18.04 LTS 90.0.4430.72-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2021-21220

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 76.0.4017.94-lp152.2.43.1
  • chromium Package Hub 15 SP2 89.0.4389.128-bp152.2.71.1
  • chromium openSUSE Leap 15.2 89.0.4389.128-lp152.2.86.1

opensuse advisories openSUSE-SU-2024:10681-1openSUSE-SU-2024:12948-1openSUSE-SU-2021:0712-1openSUSE-SU-2021:0575-1openSUSE-SU-2021:0567-1

  • chromium Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 89.0.4389.128-r0
  • qt5-qtwebengine Alpine 3.23, Alpine 3.22, Alpine 3.21 +7 more 5.15.3_git20210510-r0

alpine advisories ALPINE-CVE-2021-21220

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 89.0.4389.128-1
  • vivaldi Arch Linux 3.7.2218.55-1

arch linux advisories AVG-1816AVG-1817

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-2021-21220 updated cvss 8.8

chromium-browser: Insufficient validation of untrusted input in V8 for x86_64

  • 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. First public exploit (Metasploit exploit/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
5 y ago
Patch by
2021-11-17 (4 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Google, Chromium V8
CISA name
Google Chromium V8 Improper Input Validation Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

70.44% chance of exploitation in the next 30 days, higher than 99.3% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

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.