CVE-2018-10933 does not affect the firewall at any software code based on my findings. This is because the libssh process is not a part of the firewall software code. Please see below for more information
For PAN OS:
The PAN OS is not affected by this vulnerability as libssh is not a part of PAN-OS. Following is the link for the list of the open source softwere used in the PAN OS.
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