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TechRadar
TechRadar
Sead Fadilpašić

SonicWall tells customers to patch SonicOS flaw allowing hackers to crash firewalls

SonicWall TechRadar
Best free Linux firewalls.
  • SonicWall patches SSLVPN flaw CVE-2025-40601, enabling unauthenticated DoS attacks on Gen7/Gen8 firewalls
  • No exploitation seen yet; users urged to disable SSLVPN or restrict access if updates delayed
  • Two Email Security appliance flaws (CVE-2025-40604/40605) also fixed, preventing code execution and data access

SonicWall has released a patch for a high-severity vulnerability in its SonicOS SSLVPN service, and urged all users to update their firewalls immediately.

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