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Known affected versions were inferred from fixed-version data and were not explicitly confirmed by the vendor: 9.1.10
The earliest recollection of this bug is traced back to PAN-OS 9.1.11 - July 22, 2025. This bug is fixed in PAN-OS versions 9.1.11. Fixed an issue where, after upgrading to PAN-OS 9.1.5, VM-Series firewalls in HA configurations went into a non-functional state due to a virtual machine (VM) license mismatch. For more information: https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-11-addressed-issues
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