PT-2026-3054 · Cyberfox · Cyberfox Web Browser

Aryan Chehreghani · CVE-2021-47784 · Published 2026-01-15 · Updated 2026-01-15

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Cyberfox Web Browser version 52.9.1

Description The Cyberfox Web Browser version 52.9.1 is subject to a denial of service condition. An attacker can cause the application to crash by providing an excessively large input—specifically, a 9,000,000 byte payload—to the search bar. This input overflows the search bar, leading to an application crash.

Recommendations Update to a newer version of Cyberfox Web Browser that addresses this issue. As a temporary workaround, limit the amount of data that can be entered into the search bar.

Exploit

Fix

DoS

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2021-47784

Affected Products

Cyberfox Web Browser

References · 4

• 🔥 https://exploit-db.com/exploits/50336 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-47784 · Security Note
• https://twitter.com/CVEnew/status/2011926091141882043 · Twitter Post
• https://web.archive.org/web/20180906035057/https://cyberfox.8pecxstudios.com · Note