# CVE-2021-26419: Scripting Engine Memory Corruption Vulnerability CVE-2021-26419 is fixed in 30 products on 1 platform, first by KB5003197, released May 11, 2021. 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-2021-26419 - Priority: Urgent - CVSS: 6.4 (Critical) - EPSS: 0.2277 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation More Likely - Published: May 11, 2021 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26419 ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems | 14393.4402 | [KB5003197](https://patchblox.com/security/data/fix/microsoft/kb5003197.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems | 14393.4402 | [KB5003197](https://patchblox.com/security/data/fix/microsoft/kb5003197.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems | 17134.2208 | [KB5003174](https://patchblox.com/security/data/fix/microsoft/kb5003174.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems | 17134.2208 | [KB5003174](https://patchblox.com/security/data/fix/microsoft/kb5003174.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems | 17134.2208 | [KB5003174](https://patchblox.com/security/data/fix/microsoft/kb5003174.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems | 17763.1935 | [KB5003171](https://patchblox.com/security/data/fix/microsoft/kb5003171.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems | 17763.1935 | [KB5003171](https://patchblox.com/security/data/fix/microsoft/kb5003171.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems | 17763.1935 | [KB5003171](https://patchblox.com/security/data/fix/microsoft/kb5003171.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1909 for 32-bit Systems | 18363.1556 | [KB5003169](https://patchblox.com/security/data/fix/microsoft/kb5003169.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1909 for ARM64-based Systems | 18363.1556 | [KB5003169](https://patchblox.com/security/data/fix/microsoft/kb5003169.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1909 for x64-based Systems | 18363.1556 | [KB5003169](https://patchblox.com/security/data/fix/microsoft/kb5003169.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 2004 for 32-bit Systems | | [KB5003173](https://patchblox.com/security/data/fix/microsoft/kb5003173.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 2004 for ARM64-based Systems | | [KB5003173](https://patchblox.com/security/data/fix/microsoft/kb5003173.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 2004 for x64-based Systems | | [KB5003173](https://patchblox.com/security/data/fix/microsoft/kb5003173.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 20H2 for 32-bit Systems | | [KB5003173](https://patchblox.com/security/data/fix/microsoft/kb5003173.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 Version 20H2 for ARM64-based Systems | | [KB5003173](https://patchblox.com/security/data/fix/microsoft/kb5003173.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 for 32-bit Systems | 10240.18932 | [KB5003172](https://patchblox.com/security/data/fix/microsoft/kb5003172.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 10 for x64-based Systems | 10240.18932 | [KB5003172](https://patchblox.com/security/data/fix/microsoft/kb5003172.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 | | [KB5003233](https://patchblox.com/security/data/fix/microsoft/kb5003233.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 | | [KB5003165](https://patchblox.com/security/data/fix/microsoft/kb5003165.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 | | [KB5003233](https://patchblox.com/security/data/fix/microsoft/kb5003233.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 | | [KB5003165](https://patchblox.com/security/data/fix/microsoft/kb5003165.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 8.1 for 32-bit systems | | [KB5003209](https://patchblox.com/security/data/fix/microsoft/kb5003209.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 8.1 for 32-bit systems | | [KB5003165](https://patchblox.com/security/data/fix/microsoft/kb5003165.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 8.1 for x64-based systems | | [KB5003209](https://patchblox.com/security/data/fix/microsoft/kb5003209.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows 8.1 for x64-based systems | | [KB5003165](https://patchblox.com/security/data/fix/microsoft/kb5003165.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows RT 8.1 | | [KB5003209](https://patchblox.com/security/data/fix/microsoft/kb5003209.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB5003233](https://patchblox.com/security/data/fix/microsoft/kb5003233.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB5003165](https://patchblox.com/security/data/fix/microsoft/kb5003165.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows Server 2012 | | [KB5003208](https://patchblox.com/security/data/fix/microsoft/kb5003208.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows Server 2012 | | [KB5003165](https://patchblox.com/security/data/fix/microsoft/kb5003165.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows Server 2012 R2 | | [KB5003209](https://patchblox.com/security/data/fix/microsoft/kb5003209.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows Server 2012 R2 | | [KB5003165](https://patchblox.com/security/data/fix/microsoft/kb5003165.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows Server 2016 | 14393.4402 | [KB5003197](https://patchblox.com/security/data/fix/microsoft/kb5003197.md) | May 11, 2021 | | Microsoft | Internet Explorer 11 on Windows Server 2019 | 17763.1935 | [KB5003171](https://patchblox.com/security/data/fix/microsoft/kb5003171.md) | May 11, 2021 | | Microsoft | Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB5003210](https://patchblox.com/security/data/fix/microsoft/kb5003210.md) | May 11, 2021 | | Microsoft | Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB5003165](https://patchblox.com/security/data/fix/microsoft/kb5003165.md) | May 11, 2021 | | Microsoft | Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB5003210](https://patchblox.com/security/data/fix/microsoft/kb5003210.md) | May 11, 2021 | | Microsoft | Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB5003165](https://patchblox.com/security/data/fix/microsoft/kb5003165.md) | May 11, 2021 | --- Data as of 2026-11-08T13:06:02Z UTC. 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