Provide references for CVE-2019-13421.
Where can I find more information about CVE-2019-13421?
References are available at: https://search-guard.com/cve-advisory/, https://docs.search-guard.com/6.x-23/changelog-searchguard-6-x-23_1, https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SySS-2018-025.txt.