Atlassian used Snyk to detect and remediate Log4Shell, a widespread zero-day vulnerability found within the Log4j Java library. The company built an automation that runs Snyk Open Source scans whenever there are code changes in any repository, filing Jira tickets for security issues and assigning them to developers. After launching a security investigation following the vulnerability's announcement, Atlassian used Snyk to identify vulnerable projects and rescan all of their projects to detect Log4j instances. The company was able to remediate over 1,400 vulnerabilities within 12 hours of the original announcement. Snyk's timely and accurate security intelligence helped many companies detect Log4j in their code bases, even with indirect dependencies. The incident highlights the importance of continuously scanning for vulnerabilities, like Log4Shell, long after a patch is discovered.