CVE-2021-20600

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.

• CWE-400

• https://jvn.jp/vu/JVNVU94914666/index.htmlThird Party Advisory
• https://us-cert.cisa.gov/ics/advisories/icsa-21-280-04Third Party Advisory, US Government Resource
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-015_en.pdfVendor Advisory
• https://jvn.jp/vu/JVNVU94914666/index.htmlThird Party Advisory
• https://us-cert.cisa.gov/ics/advisories/icsa-21-280-04Third Party Advisory, US Government Resource
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-015_en.pdfVendor Advisory

Published

Oct 8, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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