https://www.heise.de/en/news/Data-leak-at-Sonicwall-All-cloud-backups-of-firewalls-stolen-10748995.html heise+ entdecken Suchen[ ] Abo Suchen[ ] * * * * * * Alle Magazine im Browser lesen IT News * Newsticker * Hintergrunde * Ratgeber * Testberichte * Meinungen Online-Magazine * heise+ * Telepolis * heise autos * bestenlisten * tipps+tricks Services * heise shop * heise jobs * heise academy * heise download * heise preisvergleich * Tarifrechner * heise compaliate * Abo bestellen * Mein Abo * Netzwerktools * iMonitor * Loseblattwerke * Spiele Uber uns * heise medien * heise regioconcept * heise business services * SponsoringLogo Hannover 96 * Mediadaten * Karriere * Presse Anzeige * Zukunft der Videokonferenzen * Themenspecial ChromeOS * Newsletter * heise-Bot * Push-Nachrichten ${title} ${title} ${intro} ${title} ${lead} ${title} ${title} ${intro} ${title} ${lead} ${content} heise+ Das Beste aus heise+ Zur heise+ Startseite ${content} heise online Top-Beitrage von heise online Zur heise online Startseite ${content} heise online Most popular articles by heise online ${content} * Newsticker * Security * IT & Tech * Developer * KI * Entertainment * Wissenschaft * Digital Health * Foren * Alle Themen Anzeige Zukunft der VideokonferenzenThemenspecial ChromeOS Advertisement Data leak at Sonicwall: All cloud backups of firewalls stolen Initially, only a few percent of backup data were thought affected; now it's 100 percent. Admins must take action. listen Print view Blackout,Concept,Emergency,Failure,Red,Light,In,Data,Centre,With Emergency in the data centre (Image: vchal/Shutterstock.com) Oct 9, 2025 at 10:04 pm CEST 1 min. read Security By * Dr. Christopher Kunz Advertisement In mid-September, firewall manufacturer Sonicwall reported an intrusion into its cloud in which configuration backups of Sonicwall customers had been copied. However, this only affected five percent of customers, according to an initial assessment by the company at the time. Sonicwall is now revising this: all customers are impacted and should take action. Anzeige As Sonicwall already explained in the first warning message, customers who have activated an optional backup of their firewall configuration data in the manufacturer's cloud are affected. Together with the incident response expert Mandiant, a Google subsidiary, Sonicwall investigated the incident in more detail and found that all customers were affected. Videos by heise mehr Videos * c't 3003 * heise & ct * Peertube Act now and mitigate follow-up attacks All customers and partners are now urgently called upon to endeavor to mitigate the possible consequences of the leak. To achieve this, they should log in to the Sonicwall portal and scrutinize all devices - sorted according to their importance -. There is a detailed playbook for this, which admins should follow so as not to make it too easy for attackers. They have already launched their first attacks; it can be assumed that the Akira ransomware group and other cyber criminals have copies of the backup files and are already using them in their ongoing attack campaigns. Jetzt heise Security Pro entdecken Jetzt heise Security Pro entdecken Jetzt heise Security Pro entdecken Jetzt heise Security Pro entdecken (cku) Don't miss any news - follow us on Facebook, LinkedIn or Mastodon. This article was originally published in German. 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