CVE-2026-107039 M66B/Marcel Bokhorst NetGuard no-root firewall - Denial of Service

M66B/Marcel Bokhorst NetGuard no-root firewall 2.337 contains insecure permissions in ActivityMain component, letting unauthorized attackers cause device reset or denial of service, exploit requires no special privileges.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.20% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
29 October 2026
Updated
31 October 2026
Weakness
CWE-732

Vendor fix

Update to the latest version with fixed permissions.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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