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A vulnerability in Palo Alto Networks PAN-OS software enables an unauthenticated attacker to cause a denial of service (DoS) to the firewall. Repeated attempts to trigger this issue results in the firewall entering into maintenance mode.

CVE-2026-0227 is a vulnerability classified under CWE-754, indicating an improper check for unusual or exceptional conditions within Palo Alto Networks' PAN-OS software, specifically affecting the Cloud Next-Generation Firewall (NGFW). The flaw allows an unauthenticated attacker to repeatedly trigger a condition that causes the firewall to enter maintenance mode, effectively resulting in a denial of service (DoS). This vulnerability does not require any authentication or user interaction, making it accessible remotely over the network. The attack vector is network-based with low complexity, and the vulnerability impacts the availability of the firewall service, which is critical for enforcing security policies and protecting enterprise networks. While confidentiality and integrity remain unaffected, the loss of firewall availability can lead to significant operational disruptions and potential exposure to other threats due to lack of perimeter defense. No patches or mitigations have been officially released at the time of publication, and no known exploits have been observed in the wild. The CVSS v4.0 score of 6.6 reflects a medium severity, considering the ease of exploitation and the impact on availability. The vulnerability highlights the importance of robust error and exception handling in security-critical software components to prevent service outages.

Detailed information about CVE-2026-0227: CWE-754 Improper Check for Unusual or Exceptional Conditions in Palo Alto Networks Cloud NGFW affecting Palo Alto Netw

CVE-2026-0227: CWE-754 Improper Check for Unusual or Exceptional Conditions in Palo Alto Networks Cloud NGFW - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-0227: CWE-754 Improper Check for Unusual or Exceptional Conditions in Palo Alto Networks Cloud NGFW

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