VulnTideExploited vulnerabilities, by vendor. Data as of 28 Oct 2026.
Known exploitedIn CISA's KEV catalog since 3 November 2021Ransomware use: unknown
Google Chromium V8

CVE-2021-21224: Google Chromium V8 Type Confusion Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, 191 days after the CVE record was published.

How likely is exploitation in the next 30 days?
84.2%

EPSS score, percentile 99.7 of all scored records

How severe?
8.8 High

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

CISA deadline 17 Nov 2021. Apply updates per vendor instructions.

Advisories and patches (5)

Which versions are affected?

Affected

  • before 90.0.4430.85

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

Required action, set by CISA

Apply updates per vendor instructions.

CISA due date for this action: 17 November 2021.

Advisories and patches

Linked from CISA's catalog entry

Affected products and versions

As listed in the CVE record.

Google Chrome
StatusVersions
Affectedbefore 90.0.4430.85

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

Google Chromium V8 Engine contains a type confusion vulnerability that allows a remote attacker to execute code inside a sandbox via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

  • CISA added CVE-2021-21224 to its Known Exploited Vulnerabilities (KEV) catalog on 3 Nov 2021.
  • CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
  • The due date CISA sets for the required action is 17 Nov 2021.
  • The CVE record was published on 26 Apr 2021, 191 days before it was added to KEV.
  • The CVE record carries a CVSS v3.1 base score of 8.8 (High), taken from CISA's enrichment of the record.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 84.2% (percentile 99.7), as of 28 Oct 2026.
  • CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

Type confusion in V8 in Google Chrome prior to 90.0.4430.85 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

  • CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

DateEvent
26 Apr 2021CVE record published
3 Nov 2021Added to CISA KEV
17 Nov 2021CISA due date for the required action
21 Oct 2025CVE record last updated

References

More exploited Google vulnerabilities

  • CVE-2026-111497: Google Brotli Unchecked Return Value Vulnerability (added 27 Oct 2026)
  • CVE-2026-58704: Google Pixel Improper Authorization Vulnerability (added 16 Sep 2026)
  • CVE-2026-87491: Google Chromium V8 Out of Bounds Write Vulnerability (added 9 Sep 2026)
  • CVE-2026-85046: Google Chromium V8 Type Confusion Vulnerability (added 4 Sep 2026)
  • CVE-2026-11645: Google Chromium V8 Out-of-Bounds Read and Write Vulnerability (added 9 Jun 2026)
  • CVE-2026-5281: Google Dawn Use-After-Free Vulnerability (added 1 Apr 2026)