---
id: "CVE-2026-107039"
kind: "vulnerability"
aliases: ["CVE-2026-107039"]
title: "NetGuard Android firewall: exported activity lets attackers force device reset"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["android", "mobile", "netguard", "other"]
not_affected_if: ["different-version", "netguard-not-installed"]
published_at: "2026-10-29T16:17:49+00:00"
first_seen_at: "2026-10-29T16:25:55+00:00"
updated_at: "2026-10-29T16:32:19+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107039", "first_seen_at": "2026-10-29T16:25:55+00:00"}]
---

# NetGuard Android firewall: exported activity lets attackers force device reset

NetGuard, a no-root Android firewall app, has insecure permissions on its ActivityMain component in version 2.337 (versionCode 2026080101). The sources say an unauthorized attacker can force a device reset or denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed NetGuard version in the app's About screen or with `dumpsys package eu.faircode.netguard` on the device.
- Confirm whether version `2.337` (versionCode `2026080101`) is installed.

## Timeline

- 2026-10-29T16:25:55+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-107039

## From the sources

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).

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_