Four-Faith F3x36 bapply.cgi Auth Bypass

published 2025-02-04 21 mo ago modified 2026-06-17 4 mo ago also EUVD-2024-50379

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits: 0; none known

The Four-Faith F3x36 router using firmware v2.0.0 is vulnerable to an authentication bypass vulnerability in the administrative web server. Authentication is not enforced on some administrative functionality when using the "bapply.cgi" endpoint instead of the normal "apply.cgi" endpoint. A remote and unauthenticated can use this vulnerability to modify settings or chain with existing authenticated vulnerabilities.

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 21 mo ago (2025-02-04)

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Four-Faith F3x36

Classification

Weakness

CWE-489 Active Debug Code
CWE-306 Missing Authentication for Critical Functionality

References

vulncheck.com /advisories/four-faith-hidden-api
third-party-advisory

Sources

CVE List CVE-2024-9644
NVD CVE-2024-9644

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Summary