CVE-2021-47784

HIGH

Cyberfox Web Browser 52.9.1 - Denial of Service via Search Bar Overflow

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-47784. PoCs published by Aryan Chehreghani.

AI-analyzed exploit summary This exploit generates a large payload of 'A' characters (9,000,000 bytes) and writes it to a file. When pasted into Cyberfox's search bar, it triggers a denial-of-service condition by overwhelming the browser's input handling.

Description

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.

Exploits (1)

exploitdb WORKING POC
by Aryan Chehreghani · pythonlocalwindows
https://www.exploit-db.com/exploits/50336

This exploit generates a large payload of 'A' characters (9,000,000 bytes) and writes it to a file. When pasted into Cyberfox's search bar, it triggers a denial-of-service condition by overwhelming the browser's input handling.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Cyberfox Web Browser v52.9.1
No auth needed
Prerequisites: Python to generate the payload file · Cyberfox Web Browser installed on the target system
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (2)

Core 2
Core References
Exploit, Third Party Advisory exploit
https://www.exploit-db.com/exploits/50336

Scores

CVSS v3 7.5
EPSS 0.0020
EPSS Percentile 10.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-770
Status published
Published Jan 15, 2026
Tracked Since Feb 18, 2026