CVE-2025-4619 Overview
A denial-of-service (DoS) vulnerability exists in Palo Alto Networks PAN-OS software that enables an unauthenticated attacker to reboot a firewall by sending a specially crafted packet through the dataplane. Repeated attempts to initiate a reboot causes the firewall to enter maintenance mode, effectively taking the security appliance offline and leaving protected networks exposed.
This vulnerability is particularly concerning as it requires no authentication and can be exploited remotely over the network. The issue is applicable to PA-Series firewalls, VM-Series firewalls, and Prisma Access software. Cloud NGFW is not affected by this vulnerability.
Critical Impact
Unauthenticated attackers can force firewall reboots and trigger maintenance mode, potentially leaving networks unprotected during critical business operations.
Affected Products
- Palo Alto Networks PA-Series Firewalls
- Palo Alto Networks VM-Series Firewalls
- Palo Alto Networks Prisma Access Software
Discovery Timeline
- 2025-11-13 - CVE-2025-4619 published to NVD
- 2025-11-14 - Last updated in NVD database
Technical Details for CVE-2025-4619
Vulnerability Analysis
This denial-of-service vulnerability stems from improper handling of exceptional conditions (CWE-754) within the PAN-OS dataplane processing logic. When the firewall receives a specially crafted network packet, the dataplane component fails to properly validate or handle the malformed input, triggering an uncontrolled system reboot.
The attack is particularly impactful because repeated exploitation forces the firewall into maintenance mode—a state designed for administrative recovery that significantly reduces or eliminates the device's ability to inspect and protect network traffic. This creates a window of opportunity for attackers to conduct further malicious activities while security controls are degraded.
The network-based attack vector means that any attacker who can send packets through the firewall's dataplane can potentially trigger this vulnerability, without requiring any prior authentication or privileged access to the system.
Root Cause
The root cause is classified as CWE-754: Improper Check for Unusual or Exceptional Conditions. The PAN-OS dataplane does not properly validate certain packet structures, failing to handle edge cases or malformed input that triggers an uncontrolled system restart. This indicates insufficient input validation and error handling within the packet processing pipeline.
Attack Vector
The attack is conducted over the network by sending specially crafted packets through the firewall's dataplane. The attacker requires network access to send traffic through the affected device, but no authentication is needed. The attack can be repeated to escalate from individual reboots to forcing the device into maintenance mode.
The exploitation flow involves:
- Attacker crafts a malicious network packet designed to trigger the vulnerability
- Packet is sent through the firewall's dataplane for processing
- PAN-OS fails to properly handle the exceptional condition in the packet
- Firewall initiates an uncontrolled reboot
- Repeated attacks force the device into maintenance mode, degrading network security
Technical details about the specific packet structure that triggers this vulnerability should be obtained from the Palo Alto Networks Security Advisory.
Detection Methods for CVE-2025-4619
Indicators of Compromise
- Unexpected firewall reboots without administrative intervention
- Multiple system restart events in rapid succession in system logs
- Firewall entering maintenance mode without scheduled maintenance
- Alerts for dataplane crashes or exceptions in PAN-OS logs
- Network connectivity disruptions correlating with firewall restarts
Detection Strategies
- Monitor PAN-OS system logs for unexpected reboot events and dataplane exceptions
- Configure SNMP traps or syslog alerts for firewall state changes and maintenance mode transitions
- Implement network monitoring to detect unusual packet patterns targeting firewall interfaces
- Review Panorama or management console for unexpected device status changes across managed firewalls
Monitoring Recommendations
- Enable verbose logging on firewall dataplane for anomaly detection
- Configure alerting thresholds for device uptime metrics to catch unexpected reboots
- Implement out-of-band monitoring for firewall health and availability
- Establish baseline device behavior to identify deviations indicative of attack attempts
How to Mitigate CVE-2025-4619
Immediate Actions Required
- Review the official Palo Alto Networks Security Advisory for affected versions and available patches
- Apply vendor-provided security updates as soon as they become available
- Monitor firewall health and implement redundancy configurations to minimize impact of potential exploitation
- Review network architecture to minimize direct exposure of firewall dataplane interfaces
Patch Information
Palo Alto Networks has addressed this vulnerability in updated versions of PAN-OS. For Prisma Access customers, Palo Alto Networks has successfully completed upgrades for most customers, with remaining customers to be scheduled through the standard upgrade process. Specific version information and patch availability should be obtained from the official security advisory.
Workarounds
- Implement high-availability configurations to maintain network protection if one firewall is forced into maintenance mode
- Configure rate limiting on management and dataplane interfaces where feasible
- Segment network traffic to reduce the attack surface exposed through firewall dataplane processing
- Monitor for and block known malicious traffic patterns if indicators become available from vendor or threat intelligence sources
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
