Palo Alto Networks Firewall Vulnerability Allows Attackers to Trigger Denial of Service

Cybersecuritynews •Guru Baran • January 15, 2026

Palo Alto Networks has patched a critical denial-of-service vulnerability in its PAN-OS firewall software, tracked as CVE-2026-0227, which lets unauthenticated attackers disrupt GlobalProtect gateways and portals. The flaw carries a CVSS v4.0 base score of 7.7 (HIGH severity), stemming from improper checks for unusual conditions that force firewalls into maintenance mode after repeated exploitation attempts. […]

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Palo Alto Networks Firewall Vulnerability Allows Denial of Service Attacks Palo Alto Networks has addressed a critical denial-of-service vulnerability in its PAN-OS firewall software, identified as CVE-2026-0227. This flaw enables unauthenticated attackers to disrupt GlobalProtect gateways and portals, with a CVSS v4.0 base score of 7.7, due to improper checks that lead firewalls into maintenance mode after repeated exploitation attempts. 2 sources 30

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Palo Alto Networks Firewall Vulnerability Allows Attackers to Trigger Denial of Service

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Attack Types (1)

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Platforms (2)