History and remediation for old modems

Tool Review: Tailsnitch
Tailsnitch is a tool to audit your Tailscale configuration. It does a comprehensive analysis of your configuration and suggests (or even applies) fixes.
https://isc.sans.edu/diary/Tool%20Review%3A%20Tailsnitch/32602
D-Link DSL Command Injection via DNS Configuration Endpoint
A new vulnerability in very old D-Link DSL modems is currently being exploited.
https://www.vulncheck.com/advisories/dlink-dsl-command-injection-via-dns-configuration-endpoint
TOTOLINK EX200 firmware-upload error handling can activate an unauthenticated root telnet service
TOTOLINK extenders may start a telnet server and allow unauthenticated access if a firmware update fails.
https://kb.cert.org/vuls/id/295169