CVE-2021-20612

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.

7.5

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.40%

Vendor Advisory mitsubishielectric.com

Affected: n/a MELSEC-F series FX3U-ENET; MELSEC-F series FX3U-ENET-L; MELSEC-F series FX3U-ENET-P502

References

Link	Tags
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-023_en.pdf	vendor advisory
https://jvn.jp/vu/JVNVU93268332/index.html	third party advisory vdb entry
https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-01	third party advisory us government resource

Frequently Asked Questions

What is the severity of CVE-2021-20612?: CVE-2021-20612 has been scored as a high severity vulnerability.
How to fix CVE-2021-20612?: To fix CVE-2021-20612, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-20612 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-20612 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-20612?: CVE-2021-20612 affects n/a MELSEC-F series FX3U-ENET; MELSEC-F series FX3U-ENET-L; MELSEC-F series FX3U-ENET-P502.

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