ERROR_SXS_ASSEMBLY_MISSING (0x80073701) on Windows Server 2019

Update 2026-06-28 Thanks to reader Panos, the 2022-2025 script should now be fixed. There was an error with the regex in the script which has been corrected in the repo. Update 2026-05-19 I have one confirmation the 2022-2025 script works. The author said they had to tweak the regex in the script but didn’t provide … Read more

Script for detecting potentially vulnerable Log4j jars [CVE-2021-44228] on Windows Server

Update 2021-12-18 – This looks like a much more competent script for detecting this vulnerability and there is a python version for Linux: https://github.com/CERTCC/CVE-2021-44228_scanner Updated 2021-12-17 – Script is v1.4 and looks for .war files now too Original post below Inspired by the one-liner here: https://gist.github.com/Neo23x0/e4c8b03ff8cdf1fa63b7d15db6e3860b#find-vulnerable-software-windows I wrote a script to expand on the command, … Read more

Windows Defender Advanced Threat Protection Service will not start after November 2021 updates

Update – 2021-12-15 – I can confirm that the December Windows Updates have fixed this issue for us.   After installing OS updates on all of our servers in November 2021 we ended up with three servers, all running 2019 Core and all Domain Controllers, where the Windows Defender Advanced Threat Protection Service would not … Read more