Improper restriction of XML external entity reference ('XXE') vulnerability in Palo Alto Networks Panorama management service allows remote unauthenticated attackers with network access to the Panorama management interface to read arbitrary files on the system. This issue affects: All versions of PAN-OS for Panorama 7.1 and 8.0; PAN-OS for Panorama 8.1 versions earlier than 8.1.13; PAN-OS for Panorama 9.0 versions earlier than 9.0.7.