CVE-2021-20612

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Una falta de control del administrador sobre la vulnerabilidad de seguridad en la serie MELSEC-F FX3U-ENET Firmware versión 1.14 y anteriores, FX3U-ENET-L Firmware versión 1.14 y anteriores y FX3U-ENET-P502 Firmware versión 1.14 y anteriores permite que un atacante remoto no autenticado cause una condición de denegación de servicio (DoS) en la función de comunicación del producto u otros efectos no especificados mediante el envío de paquetes especialmente diseñados a una apertura no necesaria del puerto TCP. El control por parte del PLC de la serie MELSEC-F no está afectado por esta vulnerabilidad, pero es necesario reiniciar el sistema para recuperarlo

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-17 CVE Reserved
2022-01-14 CVE Published
2024-08-03 CVE Updated
2024-08-20 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (3)

URL	Tag	Source
https://jvn.jp/vu/JVNVU93268332/index.html	Third Party Advisory
https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-01	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-023_en.pdf	2023-08-08

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mitsubishielectric Search vendor "Mitsubishielectric"	Fx3u-enet Firmware Search vendor "Mitsubishielectric" for product "Fx3u-enet Firmware"	<= 1.14 Search vendor "Mitsubishielectric" for product "Fx3u-enet Firmware" and version " <= 1.14"	-	Affected	in	Mitsubishielectric Search vendor "Mitsubishielectric"	Fx3u-enet Search vendor "Mitsubishielectric" for product "Fx3u-enet"	-	-	Safe
Mitsubishielectric Search vendor "Mitsubishielectric"	Fx3u-enet-l Firmware Search vendor "Mitsubishielectric" for product "Fx3u-enet-l Firmware"	<= 1.14 Search vendor "Mitsubishielectric" for product "Fx3u-enet-l Firmware" and version " <= 1.14"	-	Affected	in	Mitsubishielectric Search vendor "Mitsubishielectric"	Fx3u-enet-l Search vendor "Mitsubishielectric" for product "Fx3u-enet-l"	-	-	Safe
Mitsubishielectric Search vendor "Mitsubishielectric"	Fx3u-enet-p502 Firmware Search vendor "Mitsubishielectric" for product "Fx3u-enet-p502 Firmware"	<= 1.14 Search vendor "Mitsubishielectric" for product "Fx3u-enet-p502 Firmware" and version " <= 1.14"	-	Affected	in	Mitsubishielectric Search vendor "Mitsubishielectric"	Fx3u-enet-p502 Search vendor "Mitsubishielectric" for product "Fx3u-enet-p502"	-	-	Safe