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CVE-2021-20599

9.1 · CRITICAL

Cleartext Transmission of Sensitive InformationCleartext transmission of sensitive information vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU firmware versions "26" and prior and…

Published Oct 14, 2021CWE-319EPSS 1.40%

Overview

CVE-2021-20599 is a critical-severity vulnerability. It was published on October 14, 2021 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Cleartext Transmission of Sensitive InformationCleartext transmission of sensitive information vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU firmware versions "26" and prior and MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU firmware versions "11" and prior allows a remote unauthenticated attacker to login to a target CPU module by obtaining credentials other than password.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refjvn.jp/vu/JVNVU98578731CISAwww.cisa.gov/uscert/ics/advisories/icsa-21-287-03Refwww.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-011_en.pdfRefjvn.jp/vu/JVNVU98578731CISAwww.cisa.gov/uscert/ics/advisories/icsa-21-287-03Refwww.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-011_en.pdf

How CyberStrike helps

Frequently asked questions

What is CVE-2021-20599?

CVE-2021-20599 is a critical-severity vulnerability. It was published on October 14, 2021 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2021-20599?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-20599?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-20599?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-20599 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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