slapd in OpenLDAP before 2.4.30 allows remote attackers to cause a denial of service (assertion failure and daemon exit) via an LDAP search query with attrsOnly set to true, which causes empty attributes to be returned.
https://support.apple.com/kb/HT210788
https://seclists.org/bugtraq/2019/Dec/23
http://www.securityfocus.com/bid/52404
http://www.openldap.org/software/release/changes.html
http://www.openldap.org/its/index.cgi/Software%20Bugs?id=7143
http://www.mandriva.com/security/advisories?name=MDVSA-2012:130
http://security.gentoo.org/glsa/glsa-201406-36.xml
http://secunia.com/advisories/49607
http://secunia.com/advisories/48372