SonicWall VPN Zero-Day Vulnerability Suspected Amid Rising Ransomware Attacks

Virtual Private Networks (VPNs) have recently been in the spotlight due to the U.K.’s Online Safety Act, which requires age verification for adult content websites. While many consumers know VPNs as tools for bypassing geo-restrictions or securing public Wi-Fi connections, enterprise-grade VPN appliances play a critical role in business security. 

When researchers issue warnings about possible VPN exploitation, the risk cannot be dismissed.

SonicWall has addressed growing concerns after reports surfaced of ransomware groups targeting its devices. According to the company, an investigation revealed that the activity is linked to CVE-2024-40766, a previously disclosed vulnerability documented in their advisory SNWLID-2024-0015, rather than an entirely new zero-day flaw. Fewer than 40 confirmed cases were reported, mostly tied to legacy credentials from firewall migrations. 

Updated guidance includes credential changes and upgrading to SonicOS 7.3.0 with enhanced multi-factor authentication (MFA) protections.

Despite these reassurances, Arctic Wolf Labs researcher Julian Tuin observed a noticeable increase in ransomware activity against SonicWall firewall devices in late July. 

Several incidents involved VPN access through SonicWall SSL VPNs. While some intrusions could be explained by brute force or credential stuffing, evidence suggests the possibility of a zero-day vulnerability, as some compromised devices had the latest

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