Cyber Briefing

September 29, 2025 - Cyber Briefing


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Attackers exploited Cisco firewall zero-days, Medusa and Akira ransomware hit Comcast and SonicWall VPNs, and Ohio’s Union County suffered a ransomware attack affecting 45,000 people. Meanwhile, Dutch teens spied for pro-Russian hackers, US investors plan to take over TikTok operations, and a vital cyber data-sharing law may expire amid a government shutdown, while a South Korean data center fire took 600+ government websites offline.

👉 Important Links:

  • Cyber Events: https://cybersecurity.cybermaterial.com/s/cyber-events 

  • Cyber Jobs: https://cybersecurity.cybermaterial.com/s/cyber-jobs 

  • Cyber Book Club: https://cybersecurity.cybermaterial.com/s/cyber-book-club

  • Cyber Book : https://amzn.to/423fcCk 

  • Cyber Tools: https://cybersecurity.cybermaterial.com/s/tools  

  • Visit 911Cyber: https://911cyber.app/ 

  • Visit Cybermaterial: https://cybermaterial.com/ 


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Cyber BriefingBy CyberMaterial