# CVE-2019-0921: Internet Explorer Spoofing Vulnerability CVE-2019-0921 is fixed in 31 products on 1 platform, first by KB4494440, released May 14, 2019. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2019-0921 - Priority: Routine - CVSS: 4.3 (Important) - EPSS: 0.0331 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Less Likely - Published: May 14, 2019 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-0921 ## Description

An spoofing vulnerability exists when Internet Explorer improperly handles URLs. An attacker who successfully exploited this vulnerability could trick a user by redirecting the user to a specially crafted website. The specially crafted website could either spoof content or serve as a pivot to chain an attack with other vulnerabilities in web services.

To exploit the vulnerability, the user must click a specially crafted URL. In an email attack scenario, an attacker could send an email message containing the specially crafted URL to the user in an attempt to convince the user to click it.

In a web-based attack scenario, an attacker could host a specially crafted website designed to appear as a legitimate website to the user. However, the attacker would have no way to force the user to visit the specially crafted website. The attacker would have to convince the user to visit the specially crafted website, typically by way of enticement in an email or instant message, and then convince the user to interact with content on the website.

The security update addresses the vulnerability by changing how URLs are handled by Internet Explorer.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Internet Explorer 10 on Windows Server 2012 | | [KB4498206](https://patchblox.com/security/data/fix/microsoft/kb4498206.md) | May 14, 2019 | | Microsoft | Internet Explorer 10 on Windows Server 2012 | | [KB4499171](https://patchblox.com/security/data/fix/microsoft/kb4499171.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems | 14393.2969 | [KB4494440](https://patchblox.com/security/data/fix/microsoft/kb4494440.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems | 14393.2969 | [KB4494440](https://patchblox.com/security/data/fix/microsoft/kb4494440.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1703 for 32-bit Systems | 15063.1805 | [KB4499181](https://patchblox.com/security/data/fix/microsoft/kb4499181.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1703 for x64-based Systems | 15063.1805 | [KB4499181](https://patchblox.com/security/data/fix/microsoft/kb4499181.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems | 16299.1146 | [KB4499179](https://patchblox.com/security/data/fix/microsoft/kb4499179.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1709 for ARM64-based Systems | 16299.1146 | [KB4499179](https://patchblox.com/security/data/fix/microsoft/kb4499179.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems | 16299.1146 | [KB4499179](https://patchblox.com/security/data/fix/microsoft/kb4499179.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems | 17134.765 | [KB4499167](https://patchblox.com/security/data/fix/microsoft/kb4499167.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems | 17134.765 | [KB4499167](https://patchblox.com/security/data/fix/microsoft/kb4499167.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems | 17134.765 | [KB4499167](https://patchblox.com/security/data/fix/microsoft/kb4499167.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems | 17763.503 | [KB4494441](https://patchblox.com/security/data/fix/microsoft/kb4494441.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems | 17763.503 | [KB4494441](https://patchblox.com/security/data/fix/microsoft/kb4494441.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems | 17763.503 | [KB4494441](https://patchblox.com/security/data/fix/microsoft/kb4494441.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1903 for 32-bit Systems | | [KB4497936](https://patchblox.com/security/data/fix/microsoft/kb4497936.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems | | [KB4497936](https://patchblox.com/security/data/fix/microsoft/kb4497936.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems | | [KB4497936](https://patchblox.com/security/data/fix/microsoft/kb4497936.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 for 32-bit Systems | 10240.18215 | [KB4499154](https://patchblox.com/security/data/fix/microsoft/kb4499154.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 10 for x64-based Systems | 10240.18215 | [KB4499154](https://patchblox.com/security/data/fix/microsoft/kb4499154.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 | | [KB4499164](https://patchblox.com/security/data/fix/microsoft/kb4499164.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 | | [KB4498206](https://patchblox.com/security/data/fix/microsoft/kb4498206.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 | | [KB4499164](https://patchblox.com/security/data/fix/microsoft/kb4499164.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 | | [KB4498206](https://patchblox.com/security/data/fix/microsoft/kb4498206.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 8.1 for 32-bit systems | | [KB4499151](https://patchblox.com/security/data/fix/microsoft/kb4499151.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 8.1 for 32-bit systems | | [KB4498206](https://patchblox.com/security/data/fix/microsoft/kb4498206.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 8.1 for x64-based systems | | [KB4499151](https://patchblox.com/security/data/fix/microsoft/kb4499151.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows 8.1 for x64-based systems | | [KB4498206](https://patchblox.com/security/data/fix/microsoft/kb4498206.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows RT 8.1 | | [KB4499151](https://patchblox.com/security/data/fix/microsoft/kb4499151.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4499164](https://patchblox.com/security/data/fix/microsoft/kb4499164.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4498206](https://patchblox.com/security/data/fix/microsoft/kb4498206.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows Server 2012 | | [KB4498206](https://patchblox.com/security/data/fix/microsoft/kb4498206.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows Server 2012 R2 | | [KB4499151](https://patchblox.com/security/data/fix/microsoft/kb4499151.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows Server 2012 R2 | | [KB4498206](https://patchblox.com/security/data/fix/microsoft/kb4498206.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows Server 2016 | 14393.2969 | [KB4494440](https://patchblox.com/security/data/fix/microsoft/kb4494440.md) | May 14, 2019 | | Microsoft | Internet Explorer 11 on Windows Server 2019 | 17763.503 | [KB4494441](https://patchblox.com/security/data/fix/microsoft/kb4494441.md) | May 14, 2019 | | Microsoft | Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4499149](https://patchblox.com/security/data/fix/microsoft/kb4499149.md) | May 14, 2019 | | Microsoft | Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4498206](https://patchblox.com/security/data/fix/microsoft/kb4498206.md) | May 14, 2019 | | Microsoft | Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4499149](https://patchblox.com/security/data/fix/microsoft/kb4499149.md) | May 14, 2019 | | Microsoft | Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4498206](https://patchblox.com/security/data/fix/microsoft/kb4498206.md) | May 14, 2019 | --- Data as of 2026-11-08T13:06:02Z UTC. 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