Kempen perisian tebusan tersebut tidak pernah berlaku sebelum ini dari segi skala menurut [[Europol]].<ref name=":3" /> Serangan tersebut memberi kesan terhadap banyak hospital kendalian [[Perkhidmatan Kesihatan Kebangsaan]] di[[United UKKingdom]],<ref>{{cite web|url=http://www.cbsnews.com/news/hospitals-across-britain-hit-by-ransomware-cyberattack/|title=Global cyberattack strikes dozens of countries, cripples U.K. hospitals|website=cbsnews.com|access-date=13 May 2017}}</ref> dan sehingga 70,000 peranti – termasuklah komputer, [[pengimejan resonans magnet|pengimbas MRI]], peti sejuk simpanan darah dan peralatan dewan bedah – mungkin menerima kesan.<ref name="14MaySunTim">{{cite news|last1=Ungoed-Thomas|first1=Jon|last2=Henry|first2=Robin|last3=Gadher|first3=Dipesh|title=Cyber-attack guides promoted on YouTube|url=https://www.thetimes.co.uk/article/cyber-attack-guides-promoted-on-youtube-972s0hh2c|accessdate=14 May 2017|work=The Sunday Times|date=14 May 2017}}</ref> Pada 12 Mei, beberapa perkhidmatan NHS terpaksa mengenepikan beberapa kes kecemasan bukan kritikal, dan beberapa buah ambulans dilencongkan.<ref name="BBC news" /><ref>{{cite web|url=https://www.theguardian.com/technology/2017/may/12/global-cyber-attack-ransomware-nsa-uk-nhs|title=Massive ransomware cyber-attack hits 74 countries around the world|first1=Julia Carrie|last1=Wong|first2=Olivia|last2=Solon|date=12 May 2017 |access-date=12 May 2017 |work=[[The Guardian]] |location=London}}</ref> Pada tahun 2016, beribu-ribu buah komputer di 42 amanah NHS berasingan di England dilaporkan masih menggunakan Windows XP.<ref name=vicexp/> [[Nissan|Nissan Motor Manufacturing UK]] di [[Tyne and Wear]], salah sebuah kilang kereta paling produktif di [[Eropah]], terpaksa menghentikan pengeluaran setelah perisian tersebut menjangkiti beberapa buah sistem mereka. [[Renault]] juga menghentikan pengeluaran di beberapa buah kilang sebagai cubaan untuk menghentikan penyebaran perisian tebusan itu.<ref>{{cite web|url=http://www.independent.co.uk/news/uk/home-news/nissan-sunderland-cyber-attack-ransomware-nhs-malware-wannacry-car-factory-a7733936.html|title=Cyber-attack that crippled NHS systems hits Nissan car factory in Sunderland and Renault in France|date=13 May 2017|first=Jon|last=Sharman|website=www.independent.co.uk|access-date=13 May 2017}}</ref><ref>{{cite web|url=http://www.mirror.co.uk/news/world-news/renault-stops-production-several-plants-10413994|title=Renault stops production at several plants after ransomware cyber attack as Nissan also hacked|first1=Mathieu|last1=Rosemain|first2=Yann|last2=Le Guernigou|first3=James|last3=Davey|date=13 May 2017|website=www.mirror.co.uk|access-date=13 May 2017}}</ref>
