# CVE-2016-3258: Windows File System Security Feature Bypass Vulnerability

CVE-2016-3258 is fixed in 11 products on 1 platform, first by KB3172985, released July 12, 2016. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2016-3258
- Priority: Routine
- CVSS: 6.3 (Important)
- EPSS: 0.0093
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Jul 12, 2016
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2016-3258

## Description

<p>A security feature bypass vulnerability exists in the Windows kernel that could allow an attacker to exploit time of check time of use (TOCTOU) issues in file path-based checks from a low-integrity application. An attacker who successfully exploited this vulnerability could potentially modify files outside of a low-integrity level application.</p> <p>To exploit the vulnerability, an attacker would need to take advantage of another vulnerability to compromise the sandbox process from a low-integrity application.</p> <p>The security update addresses the vulnerability by adding a validation check on how a low-integrity application can use certain object manager features.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1511 for 32-bit Systems | 10586.494 | [KB3172985](https://patchblox.com/security/data/fix/microsoft/kb3172985.md) | Jul 12, 2016 |
| Microsoft | Windows 10 Version 1511 for x64-based Systems | 10586.494 | [KB3172985](https://patchblox.com/security/data/fix/microsoft/kb3172985.md) | Jul 12, 2016 |
| Microsoft | Windows 10 for 32-bit Systems | 10240.17024 | [KB3163912](https://patchblox.com/security/data/fix/microsoft/kb3163912.md) | Jul 12, 2016 |
| Microsoft | Windows 10 for x64-based Systems | 10240.17024 | [KB3163912](https://patchblox.com/security/data/fix/microsoft/kb3163912.md) | Jul 12, 2016 |
| Microsoft | Windows 8.1 for 32-bit systems |  | [KB3170377](https://patchblox.com/security/data/fix/microsoft/kb3170377.md) | Jul 12, 2016 |
| Microsoft | Windows 8.1 for x64-based systems |  | [KB3170377](https://patchblox.com/security/data/fix/microsoft/kb3170377.md) | Jul 12, 2016 |
| Microsoft | Windows RT 8.1 |  | [KB3170377](https://patchblox.com/security/data/fix/microsoft/kb3170377.md) | Jul 12, 2016 |
| Microsoft | Windows Server 2012 |  | [KB3170377](https://patchblox.com/security/data/fix/microsoft/kb3170377.md) | Jul 12, 2016 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB3170377](https://patchblox.com/security/data/fix/microsoft/kb3170377.md) | Jul 12, 2016 |
| Microsoft | Windows Server 2012 R2 |  | [KB3170377](https://patchblox.com/security/data/fix/microsoft/kb3170377.md) | Jul 12, 2016 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB3170377](https://patchblox.com/security/data/fix/microsoft/kb3170377.md) | Jul 12, 2016 |

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Data as of 2026-11-10T20:03:11Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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