Critical
CVE-2021-22681
https://www.cisa.gov/uscert/ncas/alerts.xml
17 Jul 2026
Iranian Actors Exploit PLCs in US Critical Infrastructure
Adversaries are exploiting Programmable Logic Controllers (PLCs) across various sectors of US critical infrastructure. This activity indicates a targeted attack aimed at disrupting physical systems. Operators should implement network segmentation, isolate control systems from IT networks, and rigorously monitor abnormal PLC command traffic.