The remote Windows host contains a web browser that is affected by multiple vulnerabilities.
The version of Mozilla Firefox ESR installed on the remote Windows host is prior to 38.7. It is, therefore, affected by multiple vulnerabilities, the majority of which are remote code execution vulnerabilities. An unauthenticated, remote attacker can exploit these issues by convincing a user to visit a specially crafted website, resulting in the execution of arbitrary code in the context of the current user.
Upgrade to Mozilla Firefox ESR version 38.7 or later.