CVE-2021-47784Cyberfox Web Browser 52.9.1 - Denial of Service (PoC)
Updated under an hour ago ()
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It affects Cyberfox Web Browser. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Jan 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cyberfox Cyberfox Web Browser cyberfox:web_browser (from the name) | 52.9.1 (Possibly all versions) | CNA record |
References
- https://www.exploit-db.com/exploits/50336exploit
- https://web.archive.org/web/20180906035057/https://cyberfox.8pecxstudios.com/product
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.