The v7.5 ISO runs openssl version 0.9.8km which is not listed as one of the vulnerable versions of openSSL.
You can check the ISO installed on your Dragon machine through the command: more /etc/da-version
DAR 4.0 94 is the v7.5 ISO image.
You can also check the openssl version on your Dragon systems through the command: openssl version
The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification Authority role and trigger unintended certificate verifications via a valid leaf certificate.