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CVE-2021-27085Internet Explorer Remote Code Execution Vulnerability

Internet Explorer Remote Code Execution Vulnerability

8.8 HIGHEPSS 5.44%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-08-19 19:22 UTC

OverviewCVSS details

8.8HIGHCVSS 3.1

Score source: microsoft (CNA)
NVD status: Analyzed
Published: Mar 11, 2021
Assigner: microsoft

Affected

Internet Explorer 11 (Microsoft)

Versions: 1.0.0 before 10.0.17134.2087
Fixed in: 10.0.17134.2087

Exploitation

Public exploit: None listed
CISA KEV: Listed · Nov 3, 2021
KEV due date: Nov 17, 2021
Ransomware use: Unknown
SSVC: Exploitation active · Automatable no · Impact partial

EPSS · FIRST, scored Nov 7

5.44%chance of exploitation in 30 days

Higher than 92.78% of CVEs

CVSS 3.1 · microsoft (CNA)

8.8High

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Changed
Confidentiality impact: Low
Integrity impact: High
Availability impact: Low

CVSS 3.1 · NVD

8.8High

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 3.1 · microsoft (CNA)

8.8High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L/E:P/RL:O/RC:C

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Changed
Confidentiality impact: Low
Integrity impact: High
Availability impact: Low

CVSS 2.0 · NVD

7.6High

AV:N/AC:H/Au:N/C:C/I:C/A:C

Attack vector: Network
Attack complexity: High
Authentication: None
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

NVD status: Analyzed

Overview Affected Products References

Overview

Severity

Score	Severity	Version	Vector String
8.8	HIGH	3.1microsoft (CNA)	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L
8.8	HIGH	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8	HIGH	3.1microsoft (CNA)	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L/E:P/RL:O/RC:C
7.6	HIGH	2.0NVD	AV:N/AC:H/Au:N/C:C/I:C/A:C

CISA required action

⚡ Known exploited · remediation due Nov 17, 2021

Apply updates per vendor instructions.

Details

CVE ID: CVE-2021-27085
Status: Analyzed
Assigner (CNA): microsoft
Published: Mar 11, 2021
Last modified: 2026-08-19 19:22 UTC

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 10:34 UTC.