CVE-2025-64721

critical

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.

References

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

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

https://github.com/sandboxie-plus/Sandboxie/commit/000492f8c411d24292f1b977a107994347bc7dfa

Details

Source: Mitre, NVD

Published: 2025-12-11

Updated: 2025-12-22

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 10

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

Severity: Critical

CVSS v4

Base Score: 9.9

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N

Severity: Critical

EPSS

EPSS: 0.00052