CVE-2025-64721: sandboxie Integer Overflow

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.

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CVSS v3.1 Score

10.0

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness Type (CWE)

CWE-190 Integer Overflow

Affected Products

Vendor	Product	Versions
sandboxie-plus	sandboxie	1.14.0 — 1.16.7

References

Advisories & Patches

https://github.com/sandboxie-plus/Sandboxie/commit/000492f8c411d24292f1b977a107994347bc7dfa https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w476-j57g-96vp https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w476-j57g-96vp

Exploits

https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w476-j57g-96vp https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w476-j57g-96vp

Other References

https://github.com/sandboxie-plus/Sandboxie/releases/tag/v1.16.7

Frequently Asked Questions

What is CVE-2025-64721? +

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. It has a CVSS v3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2025-64721? +

CVE-2025-64721 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-64721? +

CVE-2025-64721 affects products from sandboxie-plus, specifically: sandboxie. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-64721? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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