Google Chromium V8 Improper Input Validation Vulnerability

HIGH 8.8EXPLOITED (CISA KEV)CVE-2021-21220 · Published 26/04/2021 · updated 17/06/2026

Google Chromium V8 Improper Input Validation Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 03/11/2021. Patch affected systems as an emergency.

In short

CVE-2021-21220 is a HIGH (CVSS 8.8) vulnerability affecting chrome (google).
Exploited in the wild: CISA added it to the KEV catalog on 03/11/2021.
Chance of exploitation in the next 30 days (EPSS): 70.4%, higher than 99.4% of all vulnerabilities.
Fix: update to 89.0.4389.128 or later.

Package	Affected versions	Patched versions
chrome google	`< 89.0.4389.128`	`89.0.4389.128`

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.

References

packetstormsecurity.com/files/162437/Google-Chrome-XOR-Typer-Out-Of-Bounds-Access-Remote-Code-Execution.html · Exploit
packetstormsecurity.com/files/176210/Chrome-V8-JIT-XOR-Arbitrary-Code-Execution.html · Third Party Advisory
chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html · Release Notes
crbug.com/1196683 · Exploit
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EAJ42L4JFPBJATCZ7MOZQTUDGV4OEHHG · Release Notes
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U3GZ42MYPGD35V652ZPVPYYS7A7LVXVY · Release Notes
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VUZBGKGVZADNA3I24NVG7HAYYUTOSN5A · Release Notes
security.gentoo.org/glsa/202104-08

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