CVE-2021-27085VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2021-27085: Microsoft Internet Explorer Remote Code Execution Vulnerability

Affects Microsoft Internet ExplorerSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 11/03/2021
KEV deadline: 11/17/2021
EPSS: 5.4% chance of exploitation in 30 days – higher than 92% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2021-27085 (opens in a new tab)

Description

Microsoft Internet Explorer contains a vulnerability that allows remote code execution. This vulnerability has been exploited in the wild. No specific affected versions or patch information are provided in the available data.

Summary

CVE-2021-27085 is a remote code execution vulnerability in Microsoft Internet Explorer. The exact technical details of the vulnerability are unspecified. It has been confirmed that exploitation has occurred in the wild. No vendor advisory or patch information is provided, and no affected versions are explicitly stated.

Impact

Successful exploitation of this vulnerability allows an attacker to execute arbitrary code remotely on a vulnerable system running Microsoft Internet Explorer. This can lead to full compromise of the affected system.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until official fixes are confirmed, users should consider disabling Internet Explorer or using alternative browsers to reduce exposure.

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:11:36 UTC

References

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