wolfSSL prior to version 3.12.2 provides a weak Bleichenbacher oracle when any TLS cipher suite using RSA key exchange is negotiated. An attacker can recover the private key from a vulnerable wolfSSL application. This vulnerability is referred to as "ROBOT."
https://github.com/wolfSSL/wolfssl/pull/1229
https://cert-portal.siemens.com/productcert/pdf/ssa-464260.pdf
http://www.securityfocus.com/bid/102174
http://www.kb.cert.org/vuls/id/144389
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2018-002.txt