CVE-2025-64721

Critical

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.

SeverityCritical

CVSS10.0

Exploit probability—

ProductSandboxie

PublishedDec 11, 2025

First seenDec 11, 2025

Weakness typeCWE-190Integer overflow

How to fix

Update

sandboxie-plus sandboxie1.16.7 or later

Affected products

Product	Affected versions	Fixed in
sandboxie-plus sandboxie	1.14.0 ≤ v < 1.16.7	1.16.7

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