Mitsubishi Electric MELSEC-F Series Lack of Administrator Control Over Security (CVE-2021-20612)

high Tenable OT Security Plugin ID 501188

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Lack of administrator control over security vulnerability in MELSEC-F series FX3U-ENET Firmware version 1.14 and prior, FX3U-ENET-L Firmware version 1.14 and prior and FX3U-ENET-P502 Firmware version 1.14 and prior allows a remote unauthenticated attacker to cause a denial-of- service (DoS) condition in communication function of the product or other unspecified effects by sending specially crafted packets to an unnecessary opening of TCP port. Control by MELSEC-F series PLC is not affected by this vulnerability, but system reset is required for recovery.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

Mitsubishi Electric corrected this vulnerability in the following products and versions:

- FX3U-ENET: Firmware Version 1.16 or later
- FX3U-ENET-L: Firmware Version 1.16 or later
- FX3U-ENET-P502: Firmware Version 1.16 or later

Mitsubishi Electric recommends users to take the following mitigations:

- Use a firewall or virtual private network (VPN) to prevent unauthorized access when Internet access is required.
- Use within a LAN and block access from untrusted networks and hosts through firewalls.

Please contact Mitsubishi Electric Support for assistance and review the Mitsubishi Electric security advisory for more information about this issue.

Plugin Details

Severity: High

ID: 501188

Version: 1.6

Type: remote

Family: Tenable.ot

Published: 6/12/2023

Updated: 3/4/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2021-20612

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:mitsubishielectric:fx3u-enet-l_firmware, cpe:/o:mitsubishielectric:fx3u-enet-p502_firmware, cpe:/o:mitsubishielectric:fx3u-enet_firmware

Required KB Items: Tenable.ot/Mitsubishi

Exploit Ease: No known exploits are available

Patch Publication Date: 1/14/2022

Vulnerability Publication Date: 1/14/2022

Reference Information

CVE: CVE-2021-20612

CWE: 798

Detections

Analytics