What is the CVSS score of CVE-2021-27085?

CVE-2021-27085 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L. EPSS exploitation probability: 3.7%.

Is CVE-2021-27085 being actively exploited?

Yes, CVE-2021-27085 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active in-the-wild exploitation. Immediate patching is required.

Is there a patch available for CVE-2021-27085?

Yes, a patch is available for CVE-2021-27085. Update the affected software to the latest version immediately.

Microsoft CVE-2021-27085

HIGH

2021-03-11 secure@microsoft.com

RCE Microsoft

8.8

CVSS 3.1 · Vendor: microsoft

Severity by source

Vendor (microsoft) PRIMARY

8.8 HIGH

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

Primary rating from Vendor (microsoft) · only source for this CVE.

CVSS VectorVendor: microsoft

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

High

Availability

Low

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Mar 11, 2021 - 16:15 cve.org

HIGH 8.8

DescriptionCVE.org

Internet Explorer Remote Code Execution Vulnerability

AnalysisAI

Internet Explorer Remote Code Execution Vulnerability. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

Technical ContextAI

Affected products include: Microsoft Internet Explorer.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.