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CVE-2025-64721VulnerabilityPublished Updated

CVE-2025-64721: Sandboxie · Integer Overflow or Wraparound

Affects SandboxieSource CVE Database V5

0

Not known to be exploited · CVSS 9.9 Critical : upgrade to 1.16.7 as a priority.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 4.0 base score
9.9Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.7% chance of exploitation in 30 days – higher than 53% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.16.7
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Dec 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

What to do

Upgrade sandboxie-plus/Sandboxie to 1.16.7.

Affected software

ProductAffectedFixed in
GitHubsandboxie-plus/Sandboxiepkg:github/sandboxie-plus/SandboxieOther threatsAffected
  • <1.16.7
Fixed in
  • 1.16.7

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

European organizations should immediately verify their Sandboxie version and upgrade to version 1.16.7 or later, where this vulnerability is patched. If upgrading is not immediately feasible, organizations should consider disabling Sandboxie or restricting its use to trusted applications only. Network segmentation and strict application whitelisting can limit exposure by preventing untrusted code from running inside sandboxed environments. Monitoring for unusual behavior or privilege escalation attempts originating from sandboxed processes can provide early detection. Additionally, applying Windows security best practices such as least privilege principles, endpoint detection and response (EDR) solutions, and regular patch management will reduce the attack surface. Organizations should also review their incident response plans to address potential exploitation scenarios involving sandbox escapes. Vendor communication channels should be monitored for any emerging exploit reports or additional patches.

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

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