Vulnerability · Published Jan 15, 2026 · Assigned by VulnCheck
CVE-2021-47784Cyberfox Web Browser 52.9.1 - Denial of Service (PoC)
High 7.5
In plain English
A high-severity resource allocation without limits in Cyberfox Web Browser from Cyberfox. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.2%top 85.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cyberfox | Cyberfox Web Browser | 52.9.1 (Possibly all versions) |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- ExploitDB-50336 exploit
- Archived Cyberfox Web Browser Homepage product