Insecure permissions in NetGuard ActivityMain allow device resets
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
Insecure permissions in the ActivityMain component of M66B (Marcel Bokhorst) NetGuard no-root firewall, versionCode 2026080101 and versionName 2.337, let unauthorized attackers force a device reset or denial of service. The flaw is an incorrect permission assignment for a critical resource (CWE-732). A remote attacker needs no privileges and no user interaction to trigger it.
Written with Claude Haiku 5.5 from the sources below · 2026-10-30
Description from the CNA
Insecure permissions in the ActivityMain component of M66B/Marcel Bokhorst NetGuard no-root firewall versionCode 2026080101/versionName 2.337 allows unauthorized attackers to arbitrarily force a device reset or Denial of Service (DoS).
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version is listed for NetGuard no-root firewall.
Written with Claude Haiku 5.5 from the sources below · 2026-10-30
Timeline
- 2026-10-29 Threatist record created from CVE-2026-107039
- 2026-10-29 Alias added: GHSA-7x5f-mq47-xwrj
- 2026-10-30 CVSS score added · CISA ADP
- 2026-10-30 Weakness changed · CISA ADP
- 2026-10-30 CISA SSVC decision points changed
- 2026-10-30 Priority changed: LOW → HIGH
References
Sources
- CVE-2026-107039 · CVE Program
- CVE-2026-107039 · NVD
- FIRST EPSS
- GHSA-7x5f-mq47-xwrj · GitHub Advisory Database · CC BY 4.0
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