The default configuration for salt-ssh in Salt (aka SaltStack) 0.17.0 does not validate the SSH host key of requests, which allows remote attackers to have unspecified impact via a man-in-the-middle (MITM) attack.
Salt (aka SaltStack) before 0.17.1 allows remote attackers to execute arbitrary YAML code via unspecified vectors. NOTE: the vendor states that this might not be a vulnerability because the YAML to be loaded has already been determined to be safe.