CVE-2021-27085

Internet Explorer Remote Code Execution Vulnerability

CVE-2021-27085 is fixed in 16 products on 1 platform, first by KB5000809, released March 9, 2021. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021. Patch Radar priority: Patch now.

Patch nowCISA KEV

CVSS

8.8

Important

Exploitation

Exploited

Reported by the vendor

CISA KEV

Nov 3, 2021

Federal due date Nov 17, 2021

EPSS

0.0545

92nd percentile

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems	17134.2087	KB5000809	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems	17134.2087	KB5000809	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems	17134.2087	KB5000809	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems	17763.1817	KB5000822	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems	17763.1817	KB5000822	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems	17763.1817	KB5000822	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 1909 for 32-bit Systems	18363.1440	KB5000808	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 1909 for ARM64-based Systems	18363.1440	KB5000808	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 1909 for x64-based Systems	18363.1440	KB5000808	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 2004 for 32-bit Systems		KB5000802	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 2004 for ARM64-based Systems		KB5000802	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 2004 for x64-based Systems		KB5000802	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 20H2 for 32-bit Systems		KB5000802	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 20H2 for ARM64-based Systems		KB5000802	Mar 9, 2021
Internet Explorer 11 on Windows 10 Version 20H2 for x64-based Systems		KB5000802	Mar 9, 2021
Internet Explorer 11 on Windows Server 2019	17763.1817	KB5000822	Mar 9, 2021

Details

Published
March 12, 2021
CISA required action
Apply updates per vendor instructions.
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27085

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