# CVE-2017-0155: Win32k Elevation of Privilege Vulnerability

CVE-2017-0155 is fixed in 12 products on 1 platform, first by KB4015549, released April 11, 2017. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2017-0155
- Priority: Urgent
- CVSS: 7.0 (Important)
- EPSS: 0.0211
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation More Likely
- Published: Apr 11, 2017
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-0155

## Description

<p>An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.</p> <p>To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system.</p> <p>The update addresses this vulnerability by correcting how Win32k handles objects in memory.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 7 for 32-bit Systems Service Pack 1 |  | [KB4015549](https://patchblox.com/security/data/fix/microsoft/kb4015549.md) | Apr 11, 2017 |
| Microsoft | Windows 7 for 32-bit Systems Service Pack 1 |  | [KB4015546](https://patchblox.com/security/data/fix/microsoft/kb4015546.md) | Apr 11, 2017 |
| Microsoft | Windows 7 for x64-based Systems Service Pack 1 |  | [KB4015549](https://patchblox.com/security/data/fix/microsoft/kb4015549.md) | Apr 11, 2017 |
| Microsoft | Windows 7 for x64-based Systems Service Pack 1 |  | [KB4015546](https://patchblox.com/security/data/fix/microsoft/kb4015546.md) | Apr 11, 2017 |
| Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 |  | [KB4015549](https://patchblox.com/security/data/fix/microsoft/kb4015549.md) | Apr 11, 2017 |
| Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 |  | [KB4015546](https://patchblox.com/security/data/fix/microsoft/kb4015546.md) | Apr 11, 2017 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB4015549](https://patchblox.com/security/data/fix/microsoft/kb4015549.md) | Apr 11, 2017 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB4015546](https://patchblox.com/security/data/fix/microsoft/kb4015546.md) | Apr 11, 2017 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB4015549](https://patchblox.com/security/data/fix/microsoft/kb4015549.md) | Apr 11, 2017 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB4015546](https://patchblox.com/security/data/fix/microsoft/kb4015546.md) | Apr 11, 2017 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 |  | [KB4015195](https://patchblox.com/security/data/fix/microsoft/kb4015195.md) | Apr 11, 2017 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) |  | [KB4015195](https://patchblox.com/security/data/fix/microsoft/kb4015195.md) | Apr 11, 2017 |
| Microsoft | Windows Server 2008 for Itanium-Based Systems Service Pack 2 |  | [KB4015195](https://patchblox.com/security/data/fix/microsoft/kb4015195.md) | Apr 11, 2017 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 |  | [KB4015195](https://patchblox.com/security/data/fix/microsoft/kb4015195.md) | Apr 11, 2017 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) |  | [KB4015195](https://patchblox.com/security/data/fix/microsoft/kb4015195.md) | Apr 11, 2017 |
| Microsoft | Windows Vista Service Pack 2 |  | [KB4015195](https://patchblox.com/security/data/fix/microsoft/kb4015195.md) | Apr 11, 2017 |
| Microsoft | Windows Vista x64 Edition Service Pack 2 |  | [KB4015195](https://patchblox.com/security/data/fix/microsoft/kb4015195.md) | Apr 11, 2017 |

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Data as of 2026-11-08T06:59:42Z 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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