What’s Vulnerable › Vulnerabilities

CVE-2021-21186

• Severity: medium (CVSS 4.3 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: 2021-03-09 · updated 2026-06-17
• Weakness: CWE-863

Description

Insufficient policy enforcement in QR scanning in Google Chrome on iOS prior to 89.0.4389.72 allowed an attacker who convinced the user to scan a QR code to bypass navigation restrictions via a crafted QR code.

Affected products

• Debian Linux: 10.0
• Fedoraproject Fedora: 32, 33, 34
• Google Chrome: before 89.0.4389.72 — fixed in 89.0.4389.72

How to fix

Upgrade to a fixed version: Google Chrome 89.0.4389.72. Check the vendor advisory for mitigations.

References

• https://chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop.html
• https://crbug.com/1153445
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBT54RKAE5XLMWSHLVUKJ7T2XHHYMXLH/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FE5SIKEVYTMDCC5OSXGOM2KRPYLHYMQX/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCIDZ77XUDMB2EBPPWCQXPEIJERDNSNT/
• https://security.gentoo.org/glsa/202104-08
• https://www.debian.org/security/2021/dsa-4886
• https://chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop.html
• https://crbug.com/1153445
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBT54RKAE5XLMWSHLVUKJ7T2XHHYMXLH/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FE5SIKEVYTMDCC5OSXGOM2KRPYLHYMQX/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCIDZ77XUDMB2EBPPWCQXPEIJERDNSNT/

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