---
id: CVE-2025-64721
title: >-
  Sandboxie is a sandbox-based isolation software for 32-bit and 64-bit Windows
  NT-based operating systems
summary: >-
  Sandboxie is a sandbox-based isolation software for 32-bit and 64-bit Windows
  NT-based operating systems. In versions 1.16.6 and below, the SYSTEM-level
  service SbieSvc.exe exposes SbieIniServer::RC4Crypt to sandboxed processes.
  The hand…
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-190
vendor: sandboxie-plus
product: sandboxie
affected:
  - 'sandboxie >= 1.14.0, < 1.16.7'
patched:
  - sandboxie 1.16.7
published: '2025-12-11'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T20:10:00.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-64721'
references:
  - url: >-
      https://github.com/sandboxie-plus/Sandboxie/commit/000492f8c411d24292f1b977a107994347bc7dfa
    label: security-advisories@github.com
  - url: 'https://github.com/sandboxie-plus/Sandboxie/releases/tag/v1.16.7'
    label: security-advisories@github.com
  - url: >-
      https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w476-j57g-96vp
    label: security-advisories@github.com
  - url: >-
      https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w476-j57g-96vp
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00717
epssPercentile: 0.52735
ingestedAt: '2026-10-14T20:53:12.286Z'
---

## Overview

Sandboxie is a sandbox-based isolation software for 32-bit and 64-bit Windows NT-based operating systems. In versions 1.16.6 and below, the SYSTEM-level service SbieSvc.exe exposes SbieIniServer::RC4Crypt to sandboxed processes. The handler adds a fixed header size to a caller-controlled value_len without overflow checking. A large value_len (e.g., 0xFFFFFFF0) wraps the allocation size, causing a heap overflow when attacker data is copied into the undersized buffer. This allows sandboxed processes to execute arbitrary code as SYSTEM, fully compromising the host. This issue is fixed in version 1.16.7.

## Affected

- `sandboxie >= 1.14.0, < 1.16.7`

## Remediation

Upgrade past the affected range:

- `sandboxie 1.16.7`