Provide references for CVE-2021-31878.
Where can I find more information about CVE-2021-31878?
References are available at: http://seclists.org/fulldisclosure/2021/Jul/48, http://packetstormsecurity.com/files/163638/Asterisk-Project-Security-Advisory-AST-2021-007.html, http://downloads.asterisk.org/pub/security/AST-2021-007.html, https://issues.asterisk.org/jira/browse/ASTERISK-29381, https://downloads.digium.com/pub/security/AST-2021-007.html.