When there’s no patch: how to find and fence unfixed flaws

Some flaws will never get a patch, some don't have one yet, and some have one you can't install. How to find them, fence them, watch them and plan their exit.
Threat hunts and detection rules you can run, in Sigma, KQL and SPL. Each one says how it was tested.
Start here: Hunt: Plex2Shell implants in the Plex Codecs folder · The Hunt Lab repository on GitHub

Some flaws will never get a patch, some don't have one yet, and some have one you can't install. How to find them, fence them, watch them and plan their exit.

Arista's tunnel decapsulation flaw has been on CISA's KEV list since June, and Arista says no software fix is planned. Find the exposed switches and fence them with ACLs.

Microsoft's Project Perception puts red, blue and green AI agents inside Defender. Codename MDASH hunts bugs in source code. What each does, what hunters can use, and what to check before trusting the output.

Two untested draft Sigma rules for Plex2Shell on Linux: shared objects written to Plex's Codecs folder, and Plex spawning shells, downloaders or known miners.

Two critical PHP flaws allow unauthenticated RCE, and attackers were probing before the fix. Upgrade to 8.5.12, 8.4.27, 8.3.36 or 8.2.35, then hunt.