What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 70.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-04-26 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• Fedoraproject Fedora: 32, 33, 34
• Google Chrome: before 89.0.4389.128 — fixed in 89.0.4389.128

How to fix

Upgrade to a fixed version: Google Chrome 89.0.4389.128. Check the vendor advisory for mitigations.

References

• 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
• https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html
• 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%40lists.fedoraproject.org/message/U3GZ42MYPGD35V652ZPVPYYS7A7LVXVY/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VUZBGKGVZADNA3I24NVG7HAYYUTOSN5A/
• https://security.gentoo.org/glsa/202104-08
• 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
• https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html
• https://crbug.com/1196683

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