CVE-2021-20612: High severity mitsubishi electric fx3u-enet vulnerability
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2021-20612?
The severity of CVE-2021-20612 is high with a CVSS score of 7.5.
How does CVE-2021-20612 affect the MELSEC-F series FX3U-ENET?
CVE-2021-20612 affects the MELSEC-F series FX3U-ENET with Firmware version 1.14 and prior, causing a denial-of-service (DoS) condition.
Is the MELSEC-F series FX3U-ENET-L vulnerable to CVE-2021-20612?
No, the MELSEC-F series FX3U-ENET-L is not vulnerable to CVE-2021-20612.
How can I fix CVE-2021-20612 in the affected MELSEC-F series devices?
To fix CVE-2021-20612 in the MELSEC-F series devices, update the firmware to version 1.15 or later as recommended by Mitsubishi Electric.
Where can I find more information about CVE-2021-20612?
You can find more information about CVE-2021-20612 in the following references: [link1](https://jvn.jp/vu/JVNVU93268332/index.html), [link2](https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-01), [link3](https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-023_en.pdf).