Disclaimer

Known affected versions were inferred from fixed-version data and were not explicitly confirmed by the vendor: 8.1.16, 9.1.3-h1

The earliest recollection of this bug is traced back to PAN-OS 8.1.17 - July 22, 2025. This bug is fixed in PAN-OS versions 8.1.17, 9.1.4. Fixed an issue where dynamic route updates triggered an unintentional refresh of the DHCP client interface IP address, which led to the removal and re-addition of the default route associated with the DHCP client IP address and caused traffic disruption. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-17-addressed-issues https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-4-addressed-issues