CVE-2021-47784: Cyberfox Web Browser

High severity, CVSS 7.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Cyberfox Web Browser 52.9.1 contains a denial of service vulnerability that allows attackers to crash the application by overflowing the search bar with excessive data. Attackers can generate a 9,000,000 byte payload and paste it into the search bar to trigger an application crash.

Affected products

• Cyberfox Cyberfox Web Browser

Published 2026-01-15. Last modified 2026-06-17.