Identify and describe three recent major vulnerabilities in application servers or database servers that have been patched. The vulnerabilities must have been patched within the last $5$ years.For each vulnerability, summarize the root causes, how the vulnerability may have been triggered, and describe how it was patched. Include technical references and documentation $($such as$,$ actual specifications or bug reports$)$ related to the vulnerabilities. All vulnerabilities may refer to the same application server $($such as JBoss$)$ or different ones $($such as one for MS SQL Server, one for Nginx, and one for JBoss$)$