What’s Vulnerable › Vulnerabilities

CVE-2021-21208

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-26 · updated 2026-06-17
• Weakness: CWE-20

Description

Insufficient data validation in QR scanner in Google Chrome on iOS prior to 90.0.4430.72 allowed an attacker displaying a QR code to perform domain spoofing via a crafted QR code.

Affected products

• Debian Linux: 10.0
• Fedoraproject Fedora: 32, 33, 34
• Google Chrome: before 90.0.4430.72 — fixed in 90.0.4430.72

How to fix

Upgrade to a fixed version: Google Chrome 90.0.4430.72. Check the vendor advisory for mitigations.

References

• https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop_14.html
• https://crbug.com/1039539
• 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
• https://www.debian.org/security/2021/dsa-4906
• https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop_14.html
• https://crbug.com/1039539
• 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/

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