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Palo Alto Networks Firewall Vulnerability Exposes GlobalProtect to DoS Attacks

Palo Alto Networks has disclosed a critical denial-of-service (DoS) vulnerability in its PAN-OS firewall software, tracked as CVE-2026-0227, which allows unauthenticated attackers to disrupt GlobalProtect gateways and portals. The flaw, rated 7.7 (HIGH severity) under CVSS v4.0, stems from improper handling of unusual conditions, forcing affected firewalls into maintenance mode after repeated exploitation attempts.

Classified under CWE-754 (Improper Check for Unusual or Exceptional Conditions) and CAPEC-210 (Abuse Existing Functionality), the vulnerability severely impacts product availability while leaving confidentiality and integrity unaffected. The issue was identified in PAN-OS, though specific affected versions and mitigation steps have not been publicly detailed at this time. Organizations relying on Palo Alto Networks firewalls for remote access security should monitor updates for patches and remediation guidance.

Source: https://www.linkedin.com/feed/update/urn:li:activity:7417464144414535681

Palo Alto Networks cybersecurity rating report: https://www.rankiteo.com/company/palo-alto-networks

"id": "PAL1768466828",
"linkid": "palo-alto-networks",
"type": "Vulnerability",
"date": "1/2026",
"severity": "25",
"impact": "1",
"explanation": "Attack without any consequences"

{'affected_entities': [{'industry': 'Technology/Network Security',
                        'name': 'Palo Alto Networks',
                        'type': 'Cybersecurity Company'}],
 'attack_vector': 'Unauthenticated remote exploitation',
 'description': '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 stems from improper checks for unusual '
                'conditions that force firewalls into maintenance mode after '
                'repeated exploitation attempts.',
 'impact': {'operational_impact': 'Firewalls forced into maintenance mode, '
                                  'disrupting availability',
            'systems_affected': 'PAN-OS firewalls (GlobalProtect gateways and '
                                'portals)'},
 'post_incident_analysis': {'root_causes': 'Improper check for unusual or '
                                           'exceptional conditions (CWE-754)'},
 'references': [{'source': 'LinkedIn Cybersecurity News Weekly Newsletter'}],
 'title': 'Critical Denial-of-Service Vulnerability in PAN-OS Firewall '
          'Software (CVE-2026-0227)',
 'type': 'Denial-of-Service (DoS)',
 'vulnerability_exploited': 'CVE-2026-0227'}