An improper restriction of XML external entity (XXE) reference vulnerability in the Palo Alto Networks PAN-OS web interface enables an authenticated administrator to read any arbitrary file from the file system and send a specifically crafted request to the firewall that causes the service to crash. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode.
This issue impacts:
PAN-OS 8.1 versions earlier than PAN-OS 8.1.20;
PAN-OS 9.0 versions earlier than PAN-OS 9.0.14;
PAN-OS 9.1 versions earlier than PAN-OS 9.1.10;
PAN-OS 10.0 versions earlier than PAN-OS 10.0.6.
This issue does not affect Prisma Access.

Source: CVE-2021-3055

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