Exploited vulnerability · CISA KEV

Is CVE-2021-21224 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Google Chromium V8 · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-21224, Google Chromium V8 Type Confusion Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 191 days after it was published. It affects Google Chromium V8. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021

ransomwareNot knownno confirmed use

EPSStop 1%among the most likely CVEs to be exploited

severity8.8CVSS 3.1 · high

US federal due17 Nov 2021BOD 22-01 deadline

What it is

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.

Vendor	Google (77 exploited CVEs in KEV)
Product	Chromium V8
Vulnerability	Google Chromium V8 Type Confusion Vulnerability
Weakness	CWE-843
Published	26 Apr 2021
Added to KEV	3 Nov 2021
Reported by (CNA)	Chrome

What to do

Check whether you run it. Look for Chromium V8 in your asset inventory, including appliances and cloud images. Stack check lists every exploited Google CVE at once.
Apply the fix. Apply updates per vendor instructions.
If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 26 Apr 2021.
Get told next time. Email alerts when CISA adds a CVE for Google.

Other exploited CVEs in Chromium V8

CVE-2026-87491: Google Chromium V8 Out of Bounds Write Vulnerability (9 Sep 2026)
CVE-2026-85046: Google Chromium V8 Type Confusion Vulnerability (4 Sep 2026)
CVE-2026-11645: Google Chromium V8 Out-of-Bounds Read and Write Vulnerability (9 Jun 2026)
CVE-2026-3910: Google Chromium V8 Improper Restriction of Operations Within the Bounds of a Memory Buffer Vulnerability (13 Mar 2026)
CVE-2025-13223: Google Chromium V8 Type Confusion Vulnerability (19 Nov 2025)
CVE-2025-10585: Google Chromium V8 Type Confusion Vulnerability (23 Sep 2025)

References

nvd.nist.gov/vuln/detail/CVE-2021-21224

Questions

Is CVE-2021-21224 being exploited?

Yes. CISA added CVE-2021-21224 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-21224 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2021-21224?

Apply updates per vendor instructions. Check Google's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Chromium V8 and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Google scorecard · act-now radar.

Running Google in a regulated environment?

We check exposure across your estate, patch or mitigate with your team, and set up detection for what attackers do after exploiting it.

Get in touch →