A denial-of-service (DoS) vulnerability in the Simple Certificate Enrollment Protocol (SCEP) authentication feature of Palo Alto Networks PAN-OS® software enables an unauthenticated attacker to initiate system reboots using a maliciously crafted packet. Repeated attempts to initiate a reboot causes the firewall to enter maintenance mode.
PAN-OS 11.0, PAN-OS 10.0, PAN-OS 9.1, PAN-OS 9.0, and earlier PAN-OS versions have reached their software end-of-life (EoL) dates and are no longer evaluated for vulnerabilities so we do not plan to fix this issue in these EoL versions. You should presume that these versions are affected.
NOTE: You do not need to have explicitly configured SCEP on your firewall to be at risk. Firewalls for which you do not apply the explicit mitigation for this issue are affected.
Palo Alto Networks is not aware of any malicious exploitation of this issue.
PAN-OS 11.0 is EoL. We listed it in this section for completeness because we added a patch for PAN-OS 11.0 before it reached EoL. If you are running PAN-OS 11.0 in any of your firewalls, we strongly recommend that you upgrade to a fixed supported version.
We proactively initiated the upgrade through Prisma Access March 21, 2025, to cover all tenants.
If you are not using SCEP, you can disable it to mitigate this risk by running the following command in your PAN-OS command-line interface (CLI):
CAUTION: This workaround is effective only until the next reboot, after which you must rerun this command to stay protected.
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