CVE-2025-0128 in Cloud NGFW
Summary
by MITRE • 04/11/2025
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.
Cloud NGFW is not affected by this vulnerability. Prisma® Access software is proactively patched and protected from this issue.
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Analysis
by VulDB Data Team • 04/11/2025
The vulnerability identified as CVE-2025-0128 represents a critical denial-of-service weakness within the Simple Certificate Enrollment Protocol implementation of Palo Alto Networks PAN-OS software. This flaw specifically targets the authentication mechanisms used during SCEP operations, creating an avenue for unauthenticated attackers to exploit the system's reboot functionality through carefully constructed network packets. The vulnerability demonstrates a fundamental security oversight in how the firewall handles incoming authentication requests, particularly those related to certificate enrollment processes.
The technical exploitation of this vulnerability occurs through the manipulation of SCEP authentication packets that are processed by the PAN-OS software. When an attacker crafts and transmits a malicious packet to the affected firewall, the system's authentication handler fails to properly validate the incoming request, allowing the malformed data to trigger an unintended system reboot sequence. This weakness is particularly concerning because it operates at the protocol level, bypassing traditional authentication barriers and leveraging legitimate system functions to cause disruption. The vulnerability falls under CWE-20, which specifically addresses "Improper Input Validation," and demonstrates how inadequate validation of authentication parameters can lead to system compromise. The attack vector requires no prior authentication credentials, making it particularly dangerous in network environments where firewalls are exposed to untrusted networks.
The operational impact of CVE-2025-0128 extends beyond simple service disruption, as repeated exploitation attempts can force the firewall into maintenance mode, effectively rendering network security services unavailable. This maintenance mode state prevents normal network traffic processing and can result in complete network isolation for organizations relying on the affected firewall for security enforcement. The vulnerability's ability to cause repeated reboots creates a cascading effect that can overwhelm network administrators and potentially disrupt critical business operations. Organizations may experience extended downtime while system recovery procedures are implemented, and the repeated nature of the attacks makes it difficult to implement effective mitigation strategies without complete network isolation.
Security practitioners should implement immediate network segmentation to isolate affected firewall instances from untrusted networks, while monitoring for anomalous authentication traffic patterns that might indicate exploitation attempts. The recommended mitigation approach includes applying the vendor-provided patches as soon as they become available, which typically address the input validation deficiencies in the SCEP authentication handler. Network administrators should also consider implementing rate limiting and access control lists to restrict access to SCEP endpoints, preventing unauthorized exploitation attempts. Additionally, organizations should conduct thorough network audits to identify all affected PAN-OS instances and establish monitoring procedures to detect potential exploitation attempts. The ATT&CK framework categorizes this vulnerability under T1499.004, which covers "Toggle System Execution Flag," as the exploitation effectively manipulates system execution states through authentication protocol manipulation. Organizations should also review their incident response procedures to ensure rapid detection and remediation of similar vulnerabilities, particularly those affecting core network security infrastructure components.