# CVE-2017-11856: Internet Explorer Memory Corruption Vulnerability CVE-2017-11856 is fixed in 18 products on 1 platform, first by KB4048952, released November 14, 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-2017-11856 - Priority: Urgent - CVSS: 7.5 (Critical) - EPSS: 0.0563 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation More Likely - Published: Nov 14, 2017 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-11856 ## Description

A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, the attacker could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

An attacker could host a specially crafted website designed to exploit the vulnerability through Internet Explorer and then convince a user to view the website. The attacker could also take advantage of compromised websites, or websites that accept or host user-provided content or advertisements, by adding specially crafted content that could exploit the vulnerability. However, in all cases an attacker would have no way to force a user to view the attacker-controlled content. Instead, an attacker would have to convince a user to take action, typically by an enticement in an email or instant message, or by getting the user to open an attachment sent through email.

The security update addresses the vulnerability by modifying how Internet Explorer handles objects in memory.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Internet Explorer 11 on Windows 10 Version 1511 for 32-bit Systems | 10586.1232 | [KB4048952](https://patchblox.com/security/data/fix/microsoft/kb4048952.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1511 for x64-based Systems | 10586.1232 | [KB4048952](https://patchblox.com/security/data/fix/microsoft/kb4048952.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems | 14393.1884 | [KB4048953](https://patchblox.com/security/data/fix/microsoft/kb4048953.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems | 14393.1884 | [KB4048953](https://patchblox.com/security/data/fix/microsoft/kb4048953.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1703 for 32-bit Systems | | [KB4048954](https://patchblox.com/security/data/fix/microsoft/kb4048954.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1703 for x64-based Systems | | [KB4048954](https://patchblox.com/security/data/fix/microsoft/kb4048954.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems | 16299.64 | [KB4048955](https://patchblox.com/security/data/fix/microsoft/kb4048955.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems | 16299.64 | [KB4048955](https://patchblox.com/security/data/fix/microsoft/kb4048955.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 10 for 32-bit Systems | 10240.17673 | [KB4048956](https://patchblox.com/security/data/fix/microsoft/kb4048956.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 10 for x64-based Systems | 10240.17673 | [KB4048956](https://patchblox.com/security/data/fix/microsoft/kb4048956.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 | | [KB4048957](https://patchblox.com/security/data/fix/microsoft/kb4048957.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 | | [KB4047206](https://patchblox.com/security/data/fix/microsoft/kb4047206.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 | | [KB4048957](https://patchblox.com/security/data/fix/microsoft/kb4048957.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 | | [KB4047206](https://patchblox.com/security/data/fix/microsoft/kb4047206.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 8.1 for 32-bit systems | | [KB4047206](https://patchblox.com/security/data/fix/microsoft/kb4047206.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 8.1 for 32-bit systems | | [KB4048958](https://patchblox.com/security/data/fix/microsoft/kb4048958.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 8.1 for x64-based systems | | [KB4047206](https://patchblox.com/security/data/fix/microsoft/kb4047206.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows 8.1 for x64-based systems | | [KB4048958](https://patchblox.com/security/data/fix/microsoft/kb4048958.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows RT 8.1 | | [KB4048958](https://patchblox.com/security/data/fix/microsoft/kb4048958.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4048957](https://patchblox.com/security/data/fix/microsoft/kb4048957.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4047206](https://patchblox.com/security/data/fix/microsoft/kb4047206.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows Server 2012 R2 | | [KB4047206](https://patchblox.com/security/data/fix/microsoft/kb4047206.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows Server 2012 R2 | | [KB4048958](https://patchblox.com/security/data/fix/microsoft/kb4048958.md) | Nov 14, 2017 | | Microsoft | Internet Explorer 11 on Windows Server 2016 | 14393.1884 | [KB4048953](https://patchblox.com/security/data/fix/microsoft/kb4048953.md) | Nov 14, 2017 | --- Data as of 2026-11-07T18:46:35Z UTC. 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