# CVE-2021-21220: Google Chromium V8 Improper Input Validation Vulnerability

> CVE-2021-21220: Google Chromium V8 Improper Input Validation Vulnerability. CVSS 8.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-21220
Last updated: 2025-10-21T23:25:48Z

- Published: 2021-04-26 00:00 UTC · Updated: 2025-10-21 23:25 UTC · Assigner: Chrome
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 70.4%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2021-11-17, ransomware use: Unknown

## Description

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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Google: Chrome

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-21220)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-21220)
- [http://packetstormsecurity.com/files/162437/Google-Chrome-XOR-Typer-Out-Of-Bounds-Access-Remote-Code-Execution.html](http://packetstormsecurity.com/files/162437/Google-Chrome-XOR-Typer-Out-Of-Bounds-Access-Remote-Code-Execution.html)
- [http://packetstormsecurity.com/files/176210/Chrome-V8-JIT-XOR-Arbitrary-Code-Execution.html](http://packetstormsecurity.com/files/176210/Chrome-V8-JIT-XOR-Arbitrary-Code-Execution.html)
- [https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html](https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html)
- [https://crbug.com/1196683](https://crbug.com/1196683)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EAJ42L4JFPBJATCZ7MOZQTUDGV4OEHHG/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/EAJ42L4JFPBJATCZ7MOZQTUDGV4OEHHG/)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U3GZ42MYPGD35V652ZPVPYYS7A7LVXVY/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/U3GZ42MYPGD35V652ZPVPYYS7A7LVXVY/)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VUZBGKGVZADNA3I24NVG7HAYYUTOSN5A/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/VUZBGKGVZADNA3I24NVG7HAYYUTOSN5A/)
- [https://security.gentoo.org/glsa/202104-08](https://security.gentoo.org/glsa/202104-08)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-21220 · Markdown: https://rewindex.com/cve/CVE-2021-21220.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-21220 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:55.965Z