A programming error exists in a way Randombit Botan cryptographic library version 2.0.1 implements x500 string comparisons which could lead to certificate verification issues and abuse. A specially crafted X509 certificate would need to be delivered to the client or server application in order to trigger this vulnerability.
http://www.securityfocus.com/bid/98106
http://www.debian.org/security/2017/dsa-3939
http://talosintelligence.com/vulnerability_reports/TALOS-2017-0294