CVE-2021-20591

Description

Uncontrolled Resource Consumption vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules (R00/01/02CPU all versions, R04/08/16/32/120(EN)CPU all versions, R08/16/32/120SFCPU all versions, R08/16/32/120PCPU all versions, R08/16/32/120PSFCPU all versions) allows a remote unauthenticated attacker to prevent legitimate clients from connecting to the MELSOFT transmission port (TCP/IP) by not closing a connection properly, which may lead to a denial of service (DoS) condition.

References

Link	Tags
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-003_en.pdf	vendor advisory
https://jvn.jp/vu/JVNVU98060539/index.html	third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-20591?: CVE-2021-20591 has been scored as a high severity vulnerability.
How to fix CVE-2021-20591?: To fix CVE-2021-20591, 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-2021-20591 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-20591 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-2021-20591?: CVE-2021-20591 affects n/a MELSEC iQ-R series CPU modules.

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Description

Category

CWE-400 – Uncontrolled Resource Consumption

References

Frequently Asked Questions