This refers to a common filename or directory name used by certain web-based video surveillance software (e.g., AVTECH DVRs/NVRs, or other older CCTV interfaces). The viewerframe.html or viewerframe.php page typically hosts the live video viewer for security cameras.
The internet never forgets. And neither should you.
Google and other search engines have increasingly de-indexed or blocked live camera feeds from search results, especially after public backlash over sites like Insecam.org. However, archived pages from 2021 may still appear in caches (e.g., Wayback Machine) or less restrictive search engines like Shodan, Censys, or ZoomEye.
: Ethical hackers use these queries to identify vulnerable devices and notify owners.