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CVE-2021-20596

7.5 · HIGH

NULL Pointer Dereference 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…

Published Jul 22, 2021CWE-476EPSS 2.17%

Overview

CVE-2021-20596 is a high-severity vulnerability. It was published on July 22, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

NULL Pointer Dereference 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 DoS condition in communication by sending specially crafted packets. Control by MELSEC-F series PLC is not affected and system reset is required for recovery.

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/JVNVU94348759/index.htmlCISAus-cert.cisa.gov/ics/advisories/icsa-21-201-01Refwww.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdfRefjvn.jp/vu/JVNVU94348759/index.htmlCISAus-cert.cisa.gov/ics/advisories/icsa-21-201-01Refwww.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdf

How CyberStrike helps

Frequently asked questions

What is CVE-2021-20596?

CVE-2021-20596 is a high-severity vulnerability. It was published on July 22, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-20596?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-20596?

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-2021-20596?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-20596 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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