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CVE-2025-64721

10.0 · CRITICAL

Sandboxie is a sandbox-based isolation software for 32-bit and 64-bit Windows NT-based operating systems.

Published Dec 11, 2025CWE-190EPSS 0.72%

Overview

CVE-2025-64721 is a critical-severity vulnerability. It was published on December 11, 2025 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/sandboxie-plus/Sandboxie/commit/000492f8c411d24292f1b977a107994347bc7dfaGitHubgithub.com/sandboxie-plus/Sandboxie/releases/tag/v1.16.7GitHubgithub.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w476-j57g-96vpGitHubgithub.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w476-j57g-96vp

How CyberStrike helps

Frequently asked questions

What is CVE-2025-64721?

CVE-2025-64721 is a critical-severity vulnerability. It was published on December 11, 2025 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2025-64721?

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-64721?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-64721?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-64721 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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