The statistics uses data collected until 16th of july 2020. It shows an aggregation of TYPO3 patch level versions for TYPO3 webseites with a known major version. The statistics does only contain TYPO3 sites, where the patch level version could be resolved (86.92% of all sites in the database).
For websites, where it is clearly possible to analyze the TYPO3 patch level version, only 40.954 (17.09%) out of 239.548 websites use a secure TYPO3 version.
For 25.501 websites (primary old 4.x websites), the latest secure patch level version could not be resolved clearly.