The Cybersecurity and Infrastructure Security Agency (CISA), FBI, and the United Kingdom’s National Cyber Security Centre, released a fact sheet urging organizations to take defensive action against malicious cyber activity by nation-state threat actors. The document states that these actors exploit end-of-support (EOS) edge devices, such as firewalls, routers, load balancers, and virtual private network gateways, to gain network access and compromise sensitive data. It explains that EOS edge devices are no longer monitored or patched by manufacturers, which creates unresolved security gaps and increases organizational risk, particularly when devices are exposed to the public internet. The fact sheet outlines mitigations including maintaining asset inventories, replacing unsupported devices and software, and applying updates to address known vulnerabilities when immediate replacement is not possible. For additional information, readers are encouraged to review the Reducing the Attack Surface for End-of-Support Edge Devices fact sheet.