Suisun City: Cyberattack shuts down Suisun City computer systems, including 911 operations

Cyberattack Disrupts Suisun City Operations, Triggers State of Emergency

A cyberattack struck Suisun City, California, early Friday morning, crippling critical municipal systems, including 911 emergency services. The incident began around 5:45 a.m., prompting the Suisun City Council to declare a state of emergency on Saturday as IT teams worked to contain the breach.

The malicious software compromised city infrastructure, forcing officials to take affected systems offline. While details on the attack’s origin and scope remain limited, the disruption to public safety operations underscores the vulnerability of local government networks. City Hall at 701 Civic Center Blvd. serves as the central hub for impacted services.

Authorities have not disclosed whether the attack involved ransomware or other forms of malware, nor have they confirmed if data was exfiltrated. The incident follows a growing trend of cyber threats targeting municipal and emergency response systems, raising concerns about preparedness and resilience in smaller jurisdictions. Investigations are ongoing.

Source: https://localnewsmatters.org/2026/08/08/cyberattack-shuts-down-suisun-city-computer-systems-including-911-operations/

City of Suisun City cybersecurity rating report: https://www.rankiteo.com/company/suisun-city

"id": "SUI1786256624",
"linkid": "suisun-city",
"type": "Cyber Attack",
"date": "8/2026",
"severity": "100",
"impact": "6",
"explanation": "Attack threatening the economy of geographical region"

{'affected_entities': [{'industry': 'Government',
                        'location': 'Suisun City, California, USA',
                        'name': 'Suisun City',
                        'type': 'Municipal Government'}],
 'date_detected': '2023-11-03T05:45:00',
 'description': 'A cyberattack struck Suisun City, California, early Friday '
                'morning, crippling critical municipal systems, including 911 '
                'emergency services. The incident began around 5:45 a.m., '
                'prompting the Suisun City Council to declare a state of '
                'emergency on Saturday as IT teams worked to contain the '
                'breach. The malicious software compromised city '
                'infrastructure, forcing officials to take affected systems '
                'offline. While details on the attack’s origin and scope '
                'remain limited, the disruption to public safety operations '
                'underscores the vulnerability of local government networks.',
 'impact': {'operational_impact': 'Critical municipal systems crippled, state '
                                  'of emergency declared',
            'systems_affected': ['911 emergency services',
                                 'city infrastructure']},
 'investigation_status': 'Ongoing',
 'references': [{'source': 'Incident Description'}],
 'response': {'containment_measures': 'Affected systems taken offline'},
 'title': 'Cyberattack Disrupts Suisun City Operations, Triggers State of '
          'Emergency',
 'type': 'Cyberattack'}