Legacy security solutions, even when used in combination, are not designed to mitigate the risks of third-party access. Vendors, contractors, partners and employees all need access to your systems, but their reach can extend far beyond what they are permitted when accessing a flat network. These third parties become ripe targets for threat actors looking to exploit weaknesses in order to access your critical systems. This whitepaper shows the limitations of existing solutions and how a Software-Defined Perimeter solution helps solve for over-privileged access and third-party risk.