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.
History

Fri, 12 Dec 2025 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft
Microsoft windows
Sandboxie-plus
Sandboxie-plus sandboxie
Vendors & Products Microsoft
Microsoft windows
Sandboxie-plus
Sandboxie-plus sandboxie

Thu, 11 Dec 2025 21:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Sandboxie's Integer Overflow in SbieIniServer::RC4Crypt allows sandbox escape and SYSTEM compromise
Weaknesses CWE-190
References
Metrics cvssV4_0

{'score': 9.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2025-12-11T21:15:30.685Z

Updated: 2025-12-11T21:15:30.685Z

Reserved: 2025-11-10T14:07:42.922Z

Link: CVE-2025-64721

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-12-11T22:15:55.653

Modified: 2025-12-12T15:17:31.973

Link: CVE-2025-64721

cve-icon Redhat

No data.