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Outages & Breaches: April 2025 in numbers

9 significant outages (2 critical) and 9 data breaches (1 critical) were logged in April 2025. The largest breach by records was Yale New Haven Health (5.6M). The longest outage with a known duration was Spain and Portugal power grid (10 hours). The most common outage cause was cyberattack (6 of 9). 3 of the incidents mainly affected the UK.

Most significant incidents

• 28 Apr 2025Iberian blackout cuts power and connectivity for millionsSpain and Portugal power grid · outage · Power / grid · 10 hourscritical
• 22 Apr 2025M&S cyber attack halts online orders for weeksMarks & Spencer · outage · CyberattackUKcritical
• 11 Apr 2025Yale New Haven Health breach hits 5.5 million patientsYale New Haven Health · breach · Unknown · 5.6M recordscritical
• 30 Apr 2025Co-op shuts IT systems after attempted hackCo-op · outage · CyberattackUKmajor
• 25 Apr 2025Cyber attack hits Nova Scotia Power systemsNova Scotia Power · outage · Cyberattackmajor
• 25 Apr 2025MTN subscribers' data compromisedMTN Group · breach · Unknownmajor
• 23 Apr 2025Frederick Health ransomware hits nearly 1 millionFrederick Health · breach · Unknown · 934K recordsmajor
• 23 Apr 2025Blue Shield of California shared 4.7 million members' data with GoogleBlue Shield of California · breach · None (misconfiguration) · 4.7M recordsmajor

All 9 outages

• 30 Apr 2025Co-op shuts IT systems after attempted hackCo-op · outage · CyberattackUKmajor
• 28 Apr 2025Iberian blackout cuts power and connectivity for millionsSpain and Portugal power grid · outage · Power / grid · 10 hourscritical
• 27 Apr 2025Akira ransomware forces Hitachi Vantara servers offlineHitachi Vantara · outage · Cyberattackminor
• 25 Apr 2025Cyber attack hits Nova Scotia Power systemsNova Scotia Power · outage · Cyberattackmajor
• 22 Apr 2025M&S cyber attack halts online orders for weeksMarks & Spencer · outage · CyberattackUKcritical
• 16 Apr 2025Zoom down for about two hours after domain blockedZoom · outage · DNS · 2 hoursmajor
• 16 Apr 2025Spotify outage hits users worldwideSpotify · outage · Unknownmajor
• 12 Apr 2025DaVita ransomware disrupts dialysis firm's internal operationsDaVita · outage · Cyberattackmajor
• 6 Apr 2025Ransomware halts Sensata shipping and manufacturingSensata · outage · Cyberattackmajor

All 9 data breaches

• 25 Apr 2025MTN subscribers' data compromisedMTN Group · breach · Unknownmajor
• 23 Apr 2025Frederick Health ransomware hits nearly 1 millionFrederick Health · breach · Unknown · 934K recordsmajor
• 23 Apr 2025Blue Shield of California shared 4.7 million members' data with GoogleBlue Shield of California · breach · None (misconfiguration) · 4.7M recordsmajor
• 16 Apr 2025Ahold Delhaize confirms data stolen in November attackAhold Delhaize · breach · INC Ransommajor
• 14 Apr 2025Hertz customer data stolen in Clop Cleo attacksHertz · breach · Clopmajor
• 11 Apr 2025Yale New Haven Health breach hits 5.5 million patientsYale New Haven Health · breach · Unknown · 5.6M recordscritical
• 10 Apr 2025LSC breach exposes 1.6 million patientsLaboratory Services Cooperative · breach · Unknown · 1.6M recordsmajor
• 3 Apr 2025Europcar GitLab breach exposes up to 200,000 customersEuropcar · breach · Unknown · 200K claimedminor
• 2 Apr 2025144GB of Royal Mail data leaked via supplierRoyal Mail (Spectos) · breach · GHNAUKmajor