Suisun City Declares State of Emergency Following Cyberattack on Critical Services
On August 4, 2025, Suisun City, located in Solano County, California, suffered a cyberattack that disrupted key municipal operations, including public safety systems. The incident began at approximately 5:45 a.m. when "malicious software" infiltrated the city’s IT infrastructure, prompting an immediate shutdown of its entire network to preserve evidence for a federal investigation.
The attack impacted critical services such as 911 routing, police and fire dispatch, and city records management. While emergency call handling was rerouted to Solano County’s dispatch center, some software-dependent functions became temporarily unavailable. City officials confirmed there was no direct threat to public safety, though residents may experience delays in non-emergency services like bill payments and permit processing.
Suisun City declared a state of emergency on August 5, enabling faster access to emergency resources and potential cost recovery. The city is collaborating with the FBI, the Department of Homeland Security, and the California Office of Emergency Services to investigate the breach and restore systems. No timeline has been provided for full recovery.
The attack follows a recent trend of cyber incidents targeting local governments in the region. Earlier in 2025, Foster City and Pittsburg faced similar disruptions, with Foster City declaring a state of emergency after a March ransomware attack and Pittsburg losing nearly $1 million in a February phishing scam. Cybersecurity experts note that municipalities are frequent targets due to perceived vulnerabilities, often with ransom demands as the primary motive.
Source: https://www.kqed.org/news/12094482/suisun-city-declares-state-of-emergency-after-cyberattack
City of Suisun City cybersecurity rating report: https://www.rankiteo.com/company/suisun-city
City of Foster City cybersecurity rating report: https://www.rankiteo.com/company/cityoffostercity
"id": "SUICIT1786321448",
"linkid": "suisun-city, cityoffostercity",
"type": "Cyber Attack",
"date": "8/2025",
"severity": "100",
"impact": "6",
"explanation": "Attack threatening the economy of geographical region"{'affected_entities': [{'customers_affected': 'Residents of Suisun City',
'industry': 'Government',
'location': 'Solano County, California, USA',
'name': 'Suisun City',
'type': 'Municipality'}],
'attack_vector': 'Malicious software',
'customer_advisories': 'Residents may experience delays in non-emergency '
'services like bill payments and permit processing',
'date_detected': '2025-08-04T05:45:00',
'date_publicly_disclosed': '2025-08-04',
'description': 'Suisun City, located in Solano County, California, suffered a '
'cyberattack that disrupted key municipal operations, '
'including public safety systems. The incident began when '
'malicious software infiltrated the city’s IT infrastructure, '
'prompting an immediate shutdown of its entire network to '
'preserve evidence for a federal investigation. The attack '
'impacted critical services such as 911 routing, police and '
'fire dispatch, and city records management. Emergency call '
'handling was rerouted to Solano County’s dispatch center, but '
'some software-dependent functions became temporarily '
'unavailable.',
'impact': {'operational_impact': 'Disruption of critical municipal services, '
'delays in non-emergency services like bill '
'payments and permit processing',
'systems_affected': ['911 routing',
'police dispatch',
'fire dispatch',
'city records management']},
'investigation_status': 'Ongoing',
'motivation': 'Ransom demands (suspected)',
'references': [{'date_accessed': '2025-08-05',
'source': 'Cyber incident report'}],
'response': {'containment_measures': 'Immediate shutdown of entire network to '
'preserve evidence',
'law_enforcement_notified': True,
'third_party_assistance': ['FBI',
'Department of Homeland Security',
'California Office of Emergency '
'Services']},
'title': 'Suisun City Cyberattack Disrupting Critical Municipal Services',
'type': 'Cyberattack'}