Minnesota water OT exposed PLC coordinated cyberattack campaign
Campaign
Summary
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A coordinated cyberattack is disrupting more than 30 Minnesota community water systems, forcing some operators onto manual operations and increasing the risk of wider OT instability. The operation targets internet-exposed PLCs in the water and wastewater systems sector and uses access changes that can lock operators out and disconnect devices from the internet.
Related Happenings
U.S. agencies expand PLC-targeting warning and guidance
Public Sector Action
H score22
First: 29.07.2026 16:48
Last: 29.07.2026 16:48
Sources 1
About this happening:
U.S. agencies and CISA expanded a warning about Iranian-affiliated actors targeting internet-facing programmable logic controllers, raising immediate operational risk...
U.S. agencies expand PLC-targeting warning and guidance
Public Sector ActionAbout this happening: U.S. agencies and CISA expanded a warning about Iranian-affiliated actors targeting internet-facing programmable logic controllers, raising immediate operational risk...
Minnesota community water systems hit by cyberattack
Incident
H score27
First: 29.07.2026 16:48
Last: 29.07.2026 16:48
Sources 1
About this happening:
A coordinated cyberattack hit more than 30 Minnesota community water systems, forcing one plant offline and disrupting communications or automated controls at others. Br...
Minnesota community water systems hit by cyberattack
IncidentAbout this happening: A coordinated cyberattack hit more than 30 Minnesota community water systems, forcing one plant offline and disrupting communications or automated controls at others. Br...
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Public Sector Action
H score28
First: 28.07.2026 21:41
Last: 28.07.2026 21:41
Sources 1
About this happening:
CISA, ACSC, the FBI, and partners released CI Fortify – Advice for isolating vital systems for critical infrastructure operators. The guidance tells organizati...
CISA, ACSC, and FBI release CI Fortify isolation guidance for critical infrastructure
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Automatic tank gauge (ATG) systems ongoing attacks
Exploitation Wave
H score25
First: 05.06.2026 17:50
Last: 05.06.2026 17:50
Sources 1
About this happening:
Over 900 internet-exposed ATG systems across the United States are being targeted in ongoing attacks, creating risk of alert tampering, fuel or chemical leaks, and...
Automatic tank gauge (ATG) systems ongoing attacks
Exploitation WaveAbout this happening: Over 900 internet-exposed ATG systems across the United States are being targeted in ongoing attacks, creating risk of alert tampering, fuel or chemical leaks, and...
CISA-led joint advisory to secure internet-exposed ATG systems
Public Sector Action
H score43
First: 05.06.2026 17:50
Last: 05.06.2026 17:50
Sources 1
About this happening:
On 2026-06-05, CISA, the FBI, the NSA, the Department of Energy, and other U.S. partners issued a joint advisory telling critical infrastructure organiza...
CISA-led joint advisory to secure internet-exposed ATG systems
Public Sector ActionAbout this happening: On 2026-06-05, CISA, the FBI, the NSA, the Department of Energy, and other U.S. partners issued a joint advisory telling critical infrastructure organiza...
Timeline
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31.07.2026 19:49 2 articles · 2h ago
Minnesota water OT exposed PLC coordinated cyberattack campaign
Initial DisclosureAttackers began targeting internet-exposed PLCs in Minnesota water systems last Sunday and continued through Monday, disrupting equipment and operator access. The early phase centered on access interference that pushed some utilities into manual operations.
Show sources
- CISA warns of cyberattacks disrupting U.S. water utilities — www.bleepingcomputer.com — 31.07.2026 19:49
- CISA warns of cyberattacks disrupting U.S. water utilities — www.bleepingcomputer.com — 31.07.2026 19:49