title: PAN-OS: Integer underflow in the management interface
description: An integer underflow vulnerability in the dnsproxyd component of the PAN-OS management interface allows authenticated administrators to issue a command from the command line interface that causes the component to stop responding. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode. This issue impacts: PAN-OS 9.1 versions earlier than PAN-OS 9.1.3. This issue does not impact PAN-OS 8.1, PAN-OS 9.0, or Prisma Access services.
problem types: CWE-191 Integer Underflow (Wrap or Wraparound)
affected:
{
product: PAN-OS
vendor: Palo Alto Networks
versions:
status: unaffected, version: 9.0.*
status: unaffected, version: 8.1.*
changes: [at: 9.1.3, status: unaffected], lessThan: 9.1.3, status: affected, version: 9.1, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 4.9
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: HIGH
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
version: 3.1
]
solutions: This issue is fixed in PAN-OS 9.1.3 and all later PAN-OS versions.
workarounds: This issue impacts the PAN-OS management interface but you can mitigate the impact of this issue by following best practices for securing the PAN-OS management interface. Please review the Best Practices for Securing Administrative Access in the PAN-OS technical documentation, available at https://docs.paloaltonetworks.com/best-practices.