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Log4ShellScanner
Scans and catches callbacks of systems that are impacted by Log4J Log4Shell vulnerability across specific headers.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
blumira, a security company, also made an open-source utility that will scan log4j files to check for any usage of the vulnerability https://github.com/mwarnerblu/Log4ShellScanner
Apparently there's proof Steam along with many others are vulnerable.
NOTE:
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Hence, a higher number means a more popular project.