Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sandboxie-Plus | Sandboxie | >= 1.14.0, < 1.16.7 |
Related Weaknesses (CWE)
References
- https://github.com/sandboxie-plus/Sandboxie/commit/000492f8c411d24292f1b977a1079Patch
- https://github.com/sandboxie-plus/Sandboxie/releases/tag/v1.16.7Release Notes
- https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w476-j57g-9ExploitVendor Advisory
- https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w476-j57g-9ExploitVendor Advisory
FAQ
What is CVE-2025-64721?
CVE-2025-64721 is a vulnerability with a CVSS score of 10.0 (CRITICAL). 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::RC4C...
How severe is CVE-2025-64721?
CVE-2025-64721 has been rated CRITICAL with a CVSS base score of 10.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-64721?
Check the references section above for vendor advisories and patch information. Affected products include: Sandboxie-Plus Sandboxie.