What’s Vulnerable › Vulnerabilities

CVE-2021-21111

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-01-08 · updated 2026-06-17
• Weakness: CWE-1021

Description

Insufficient policy enforcement in WebUI in Google Chrome prior to 87.0.4280.141 allowed an attacker who convinced a user to install a malicious extension to potentially perform a sandbox escape via a crafted Chrome Extension.

Affected products

• Debian Linux: 10.0
• Fedoraproject Fedora: 32, 33
• Google Chrome: before 87.0.4280.141 — fixed in 87.0.4280.141

How to fix

Upgrade to a fixed version: Google Chrome 87.0.4280.141. Check the vendor advisory for mitigations.

References

• https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop.html
• https://crbug.com/1149125
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VVUWIJKZTZTG6G475OR6PP4WPQBVM6PS/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z6P6AVVFP7B2M4H7TJQBASRZIBLOTUFN/
• https://security.gentoo.org/glsa/202101-05
• https://www.debian.org/security/2021/dsa-4832
• https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop.html
• https://crbug.com/1149125
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VVUWIJKZTZTG6G475OR6PP4WPQBVM6PS/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z6P6AVVFP7B2M4H7TJQBASRZIBLOTUFN/
• https://security.gentoo.org/glsa/202101-05
• https://www.debian.org/security/2021/dsa-4832

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