# CVE-2020-0981: Windows Token Security Feature Bypass Vulnerability

CVE-2020-0981 is fixed in 8 products on 1 platform, first by KB4549951, released April 14, 2020. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-0981
- Priority: Routine
- CVSS: 6.3 (Important)
- EPSS: 0.0127
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Apr 14, 2020
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-0981

## Description

<p>A security feature bypass vulnerability exists when Windows fails to properly handle token relationships.</p> <p>An attacker who successfully exploited the vulnerability could allow an application with a certain integrity level to execute code at a different integrity level, leading to a sandbox escape.</p> <p>The update addresses the vulnerability by correcting how Windows handles token relationships</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1903 for 32-bit Systems |  | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 |
| Microsoft | Windows 10 Version 1903 for ARM64-based Systems |  | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 |
| Microsoft | Windows 10 Version 1903 for x64-based Systems |  | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 |
| Microsoft | Windows 10 Version 1909 for 32-bit Systems |  | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 |
| Microsoft | Windows 10 Version 1909 for ARM64-based Systems |  | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 |
| Microsoft | Windows 10 Version 1909 for x64-based Systems |  | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 |
| Microsoft | Windows Server, version 1903 (Server Core installation) |  | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 |
| Microsoft | Windows Server, version 1909 (Server Core installation) |  | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 |

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Data as of 2026-11-08T19:12:23Z 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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