Off-by-one error in the UTF8StringNormalize function in OpenLDAP 2.4.26 and earlier allows remote attackers to cause a denial of service (slapd crash) via a zero-length string that triggers a heap-based buffer overflow, as demonstrated using an empty postalAddressAttribute value in an LDIF entry.
https://exchange.xforce.ibmcloud.com/vulnerabilities/70991
https://bugzilla.redhat.com/show_bug.cgi?id=749324
http://www.ubuntu.com/usn/USN-1266-1
http://www.securityfocus.com/bid/50384
http://www.openwall.com/lists/oss-security/2011/10/26/9
http://www.openwall.com/lists/oss-security/2011/10/26/5
http://www.openldap.org/its/index.cgi/Software%20Bugs?id=7059%3Bselectid=7059