Is CVE-2025-64721 actively exploited?

No active exploitation of CVE-2025-64721 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-64721 be exploited remotely?

Yes. CVE-2025-64721 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-64721?

CVE-2025-64721 has a CVSS score of 10.0 (CRITICAL).

HOME VULNERABILITIESCVE-2025-64721

CRITICAL

CVE-2025-64721

CWE-190Published: December 11, 2025· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2025-64721 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.