CVE-2021-20611
7.5 · HIGHOverview
CVE-2021-20611 is a high-severity vulnerability affecting mitsubishi melsec_iq-r_r00_cpu_firmware. It was published on December 1, 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
Improper Input Validation vulnerability in Mitsubishi Electric MELSEC iQ-R Series R00/01/02CPU, MELSEC iQ-R Series R04/08/16/32/120(EN)CPU, MELSEC iQ-R Series R08/16/32/120SFCPU, MELSEC iQ-R Series R08/16/32/120PCPU, MELSEC iQ-R Series R08/16/32/120PSFCPU, MELSEC iQ-R Series R16/32/64MTCPU, MELSEC iQ-R Series R12CCPU-V, MELSEC Q Series Q03UDECPU, MELSEC Q Series Q04/06/10/13/20/26/50/100UDEHCPU, MELSEC Q Series Q03/04/06/13/26UDVCPU, MELSEC Q Series Q04/06/13/26UDPVCPU, MELSEC Q Series Q12DCCPU-V, MELSEC Q Series Q24DHCCPU-V(G), MELSEC Q Series Q24/26DHCCPU-LS, MELSEC Q Series MR-MQ100, MELSEC Q Series Q172/173DCPU-S1, MELSEC Q Series Q172/173DSCPU, MELSEC Q Series Q170MCPU, MELSEC Q Series Q170MSCPU(-S1), MELSEC L Series L02/06/26CPU(-P), MELSEC L Series L26CPU-(P)BT and MELIPC Series MI5122-VW allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition by sending specially crafted packets. System reset is required for recovery.
Remediation
Check the references section for vendor advisories and patches from mitsubishi. Update melsec_iq-r_r00_cpu_firmware to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| mitsubishi | melsec_iq-r_r00_cpu_firmware | 0 | Affected |
| mitsubishi | melsec_iq-r_r01_cpu_firmware | 0 | Affected |
| mitsubishi | melsec_iq-r_r02_cpu_firmware | 0 | Affected |
| mitsubishi | melsec_iq-r_r04_cpu_firmware | 0 | Affected |
| mitsubishi | melsec_iq-r_r08_cpu_firmware | 0 | Affected |
| mitsubishi | melsec_iq-r_r120_cpu_firmware | 0 | Affected |
| mitsubishi | melsec_iq-r_r16_cpu_firmware | 0 | Affected |
| mitsubishi | melsec_iq-r_r32_cpu_firmware | 0 | Affected |
| mitsubishi | melsec_iq-r_r04_pcpu_firmware | 0 | Affected |
| mitsubishi | melsec_iq-r_r08_pcpu_firmware | 0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-20611?
CVE-2021-20611 is a high-severity vulnerability affecting mitsubishi melsec_iq-r_r00_cpu_firmware. It was published on December 1, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2021-20611?
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-2021-20611?
Check the references section for vendor advisories and patches from mitsubishi. Update melsec_iq-r_r00_cpu_firmware to the latest patched version. 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-2021-20611?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-20611 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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