What’s Vulnerable › Vulnerabilities

CVE-2025-64721: Sandboxie's Integer Overflow in SbieIniServer::RC4Crypt allows sandbox escape and SYSTEM compromise

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-11 · updated 2026-10-14
• Weakness: CWE-190

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.

Affected products

• sandboxie-plus Sandboxie: from 1.14.0 before 1.16.7 — fixed in 1.16.7

How to fix

Upgrade to a fixed version: sandboxie-plus Sandboxie 1.16.7. Check the vendor advisory for mitigations.

References

• https://github.com/sandboxie-plus/Sandboxie/commit/000492f8c411d24292f1b977a107994347bc7dfa
• https://github.com/sandboxie-plus/Sandboxie/releases/tag/v1.16.7
• https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w476-j57g-96vp
• https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w476-j57g-96vp

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