# CVE-2018-0833: Windows Denial of Service Vulnerability

CVE-2018-0833 is fixed in 5 products on 1 platform, first by KB4074597, released February 13, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-0833
- Priority: Routine
- CVSS: 4.8 (Moderate)
- EPSS: 0.4016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: N/A
- Published: Feb 13, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-0833

## Description

<p>A denial of service vulnerability exists in implementations of the Microsoft Server Message Block 2.0 and 3.0 (SMBv2/SMBv3) client. The vulnerability is due to improper handling of certain requests sent by a malicious SMB server to the client. An attacker who successfully exploited this vulnerability could cause the affected system to stop responding until it is manually restarted.</p> <p>To exploit the vulnerability, an attacker could use various methods such as redirectors, injected HTML header links, etc., which could cause the SMB client to connect to a malicious SMB server.</p> <p>The security update addresses the vulnerability by correcting how the Microsoft SMBv2/SMBv3 Client handles specially crafted requests.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 8.1 for 32-bit systems |  | [KB4074597](https://patchblox.com/security/data/fix/microsoft/kb4074597.md) | Feb 13, 2018 |
| Microsoft | Windows 8.1 for 32-bit systems |  | [KB4074594](https://patchblox.com/security/data/fix/microsoft/kb4074594.md) | Feb 13, 2018 |
| Microsoft | Windows 8.1 for x64-based systems |  | [KB4074597](https://patchblox.com/security/data/fix/microsoft/kb4074597.md) | Feb 13, 2018 |
| Microsoft | Windows 8.1 for x64-based systems |  | [KB4074594](https://patchblox.com/security/data/fix/microsoft/kb4074594.md) | Feb 13, 2018 |
| Microsoft | Windows RT 8.1 |  | [KB4074594](https://patchblox.com/security/data/fix/microsoft/kb4074594.md) | Feb 13, 2018 |
| Microsoft | Windows Server 2012 R2 |  | [KB4074597](https://patchblox.com/security/data/fix/microsoft/kb4074597.md) | Feb 13, 2018 |
| Microsoft | Windows Server 2012 R2 |  | [KB4074594](https://patchblox.com/security/data/fix/microsoft/kb4074594.md) | Feb 13, 2018 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB4074597](https://patchblox.com/security/data/fix/microsoft/kb4074597.md) | Feb 13, 2018 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB4074594](https://patchblox.com/security/data/fix/microsoft/kb4074594.md) | Feb 13, 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