CVE-2021-27085

HIGH8.8

CISA KEV

Published 2021-03-11 · Updated 2026-08-19 · Source secure@microsoft.com

Summary

CVE-2021-27085 is a high-severity (CVSS 8.8) vulnerability in Microsoft Internet Explorer. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 17, 2021. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

All 390 known-exploited Microsoft vulnerabilities →

Description

Internet Explorer Remote Code Execution Vulnerability

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L

CISA Known-Exploited Vulnerability

Product: Microsoft — Internet Explorer

Name: Microsoft Internet Explorer Remote Code Execution Vulnerability

Date added: 2021-11-03 · Due: 2021-11-17

Required action: Apply updates per vendor instructions.

References

View on NVD

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