---
title: "CVE-2026-77853: FF-RFI - OS Command Injection"
description: "FF-RFI079I4 and FF-RFI078I4 contain an OS command injection caused by improper neutralization of special elements in M-Plane (NETCONF), letting logged-in users execute arbitrary OS commands."
url: https://panop.io/threat-heartbeat/CVE-2026-77853/
---

# CVE-2026-77853 FF-RFI - OS Command Injection

FF-RFI079I4 and FF-RFI078I4 contain an OS command injection caused by improper neutralization of special elements in M-Plane (NETCONF), letting logged-in users execute arbitrary OS commands.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

1.88% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-77853)

## Details

Type

OS Command Injection

Impact

Remote Code Execution

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-78](https://cwe.mitre.org/data/definitions/78.html)

## Vendor fix

Update to the latest version or apply vendor patches addressing this issue.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-77853](https://nvd.nist.gov/vuln/detail/CVE-2026-77853)
- [https://jvn.jp/en/jp/JVN02049764/](https://jvn.jp/en/jp/JVN02049764/)
- [https://5g.liteon.com/security/flexfi/](https://5g.liteon.com/security/flexfi/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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