An issue in DrayTek Vigor310 devices through 4.3.2.6 allows an attacker to obtain sensitive information because the httpd server of the Vigor management UI uses a static string for seeding the PRNG of OpenSSL.
https://www.forescout.com/resources/draybreak-draytek-research/
https://www.forescout.com/resources/draytek14-vulnerabilities