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CVE-2021-20600

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-08 · updated 2026-06-17
• Weakness: CWE-400

Description

Uncontrolled resource consumption in Mitsubishi Electric MELSEC iQ-R series C Controller Module R12CCPU-V Firmware Versions "16" and prior allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition by sending a large number of packets in a short time while the module starting up. System reset is required for recovery.

Affected products

• Mitsubishi Electric MELSEC iQ-R series C Controller Module R12CCPU-V: through 16

References

• https://jvn.jp/vu/JVNVU94914666/index.html
• https://us-cert.cisa.gov/ics/advisories/icsa-21-280-04
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-015_en.pdf
• https://jvn.jp/vu/JVNVU94914666/index.html
• https://us-cert.cisa.gov/ics/advisories/icsa-21-280-04
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-015_en.pdf

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