CVE-2024-12856: The Four-Faith router models F3x24 and F3x36 are affected by an operating system (OS) command injection vulner

This week

HIGH 7.2MITIGATEMITIGATE

CVE-2024-12856 is a high-severity flaw (CVSS 7.2) affecting f3x36 firmware, f3x24 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Four-Faith router models F3x24 and F3x36 are affected by an operating system (OS) command injection vulnerability. At least firmware version 2.0 allows authenticated and remote attackers to execute arbitrary OS commands over HTTP when modifying the system time via apply.cgi. Additionally, this firmware version has default credentials which, if not changed, would effectively change this vulnerability into an unauthenticated and remote OS comma

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	84.1% (top 1%)
CISA exploited list	No
Weakness	CWE-78, CWE-1392
Published	2024-12-27
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: four-faith

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-12-27 16:15 UTCPublished CVE record published
2026-06-17 07:00 UTCUpdated Record last modified

four-faith f3x36 firmware MITIGATE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

four-faith f3x24 firmware MITIGATE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Advisories and coverage

Research and news

VulnCheck Blog: Four-Faith Industrial Router CVE-2024-12856 Exploited in the Wild 2024-12-27

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-12856?

f3x36 firmware: mitigate or apply the listed mitigation; f3x24 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-12856 being exploited?

CVE-2024-12856 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-12856 affect?

CVE-2024-12856 affects f3x36 firmware, f3x24 firmware. Severity is high (CVSS 7.2). The Four-Faith router models F3x24 and F3x36 are affected by an operating system (OS) command injection vulnerability. At least firmware version 2.0 allows authenticated and remote attackers to execute arbitrary OS commands over HTTP when m

How urgent is CVE-2024-12856?

Priority 55/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference

References

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