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

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MEDIUM

Cyberfox Web Browser 52.9.1 - Denial of Service (PoC)

Published Jan 15, 2026

6.7

MEDIUM

CVSS 4.0

EPSS 0.23%

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

Vendor Cyberfox Product Cyberfox Web Browser Default
n/a
- Version
  52.9.1 (Possibly all versions)
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Cyberfox Web Browser

n/a

Version	Status	Constraints
52.9.1 (Possibly all versions)	affected	-

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-770

Allocation of Resources Without Limits

References (2)

Link	Providers	Tags
https://web.archive.org/web/20180906035057/https://cyberfox.8pecxstudios.com/		product
https://www.exploit-db.com/exploits/50336		exploit

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner VulnCheck

Published Jan 15, 2026

Updated Jan 15, 2026

Reserved Jan 14, 2026

Link CVE-2021-47784

CISA Vulnrichment

Updated Jan 15, 2026

Status Deferred

Modified Jun 17, 2026

Link CVE-2021-47784

Severity n/a

Public date n/a

Links CVE-2021-47784