CVE-2021-47784 MEDIUM

CVE-2021-47784: Cyberfox Web Browser 52.9.1 - Denial of Service (PoC)

Vendor Cyberfox
Product Cyberfox Web Browser
Weakness CWE-770 · Uncontrolled resource consumption
Published January 15, 2026
Last update January 15, 2026
View on NVD All CVEs

CVSS base score

6.7/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 15, 2026 CVE published
January 15, 2026 Record updated