# CVE-2018-8637: Win32k Information Disclosure Vulnerability

CVE-2018-8637 is fixed in 9 products on 1 platform, first by KB4471324, released December 11, 2018. 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-2018-8637
- Priority: Urgent
- CVSS: 4.7 (Important)
- EPSS: 0.0185
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation More Likely
- Published: Dec 11, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8637

## Description

<p>An information disclosure vulnerability exists in Windows kernel that could allow an attacker to retrieve information that could lead to a Kernel Address Space Layout Randomization (KASLR) bypass. An attacker who successfully exploited this vulnerability could retrieve the memory address of a kernel object.</p> <p>To exploit this vulnerability, an attacker would have to log on to an affected system and run a specially crafted application.</p> <p>The security update addresses the vulnerability by correcting how the Windows kernel handles memory addresses.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.471 | [KB4471324](https://patchblox.com/security/data/fix/microsoft/kb4471324.md) | Dec 11, 2018 |
| Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.471 | [KB4471324](https://patchblox.com/security/data/fix/microsoft/kb4471324.md) | Dec 11, 2018 |
| Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.471 | [KB4471324](https://patchblox.com/security/data/fix/microsoft/kb4471324.md) | Dec 11, 2018 |
| Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.194 | [KB4471332](https://patchblox.com/security/data/fix/microsoft/kb4471332.md) | Dec 11, 2018 |
| Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.194 | [KB4471332](https://patchblox.com/security/data/fix/microsoft/kb4471332.md) | Dec 11, 2018 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.194 | [KB4471332](https://patchblox.com/security/data/fix/microsoft/kb4471332.md) | Dec 11, 2018 |
| Microsoft | Windows Server 2019 | 17763.194 | [KB4471332](https://patchblox.com/security/data/fix/microsoft/kb4471332.md) | Dec 11, 2018 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.194 | [KB4471332](https://patchblox.com/security/data/fix/microsoft/kb4471332.md) | Dec 11, 2018 |
| Microsoft | Windows Server, version 1803  (Server Core Installation) | 17134.471 | [KB4471324](https://patchblox.com/security/data/fix/microsoft/kb4471324.md) | Dec 11, 2018 |

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Data as of 2026-11-07T12:40:37Z 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