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CVE-2025-64721

Sandboxie-plus Sandboxie remote code execution

10.0 CRITICALPublic exploitEPSS 0.72%
  1. Published11 Dec 2025

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Sandboxie-plus Sandboxie≥ 1.14.0 < 1.16.7

Remediation

Fixed in
Sandboxie-plus Sandboxie≥ 1.16.7

References

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Frequently asked

Is CVE-2025-64721 being actively exploited?

CVE-2025-64721 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.72%.

How severe is CVE-2025-64721?

CVE-2025-64721 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.72% probability of exploitation.

Which products are affected by CVE-2025-64721?

Affected products include Sandboxie-plus Sandboxie.

How do I fix CVE-2025-64721?

Upgrade affected software to a fixed version, for example Sandboxie-plus Sandboxie 1.16.7 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-64721 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.