The CISA Alert: Security Beyond Solitary Confinement
Summary
The article reviews the CISA alert about exposing OT to the Internet and argues for defense strategies beyond locking down credentials, highlighting SYN greylisting as a lightweight, hardware-free defense in JANOS. It details how SYN greylisting reduces attacker reconnaissance and CPU load, including experiments showing dramatic differences when the feature is enabled versus disabled, and calls for broader adoption of such techniques in embedded TCP/IP stacks.