Hazard

Is CVE-2024-40766 being exploited?

Ransomware crews are using this

CISA has linked this vulnerability to known ransomware campaigns. Treat any exposed instance as an active incident, not a patching ticket.

SonicWall SonicOS Improper Access Control Vulnerability

SonicWall · SonicOS

CVSS 9.8 EPSS 18% no public exploit indexed ransomware Fix deadline passed 30 September 2024

What it is

SonicWall SonicOS contains an improper access control vulnerability that could lead to unauthorized resource access and, under certain conditions, may cause the firewall to crash.

Why we say that

  • Linked by CISA to known ransomware campaigns
  • CISA's federal remediation deadline (2024-09-30) has passed
  • CVSS 9.8 critical
  • Listed in the CISA Known Exploited Vulnerabilities catalogue

Every line above comes from a named public source. Where the evidence is thin, we say so rather than inventing confidence — see methodology.

What to do

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What it costs when this goes wrong

This is where UK enforcement meets the vulnerability record. This vulnerability is used in ransomware campaigns; here is what ransomware has cost UK organisations at the regulator.

All UK cases caused by ransomware →