The earliest recollection of this bug is traced back to PAN-OS 8.1.9-h4 - January 09, 2024. This bug is fixed in PAN-OS versions 8.1.9-h4. A security-related fix was made to prevent a memory corruption vulnerability in PAN-OS® software ( PAN-SA-2019-0023 / CVE-2019-1582). For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-9-h4-addressed-issues