Which products and versions are affected by CVE-2021-27085?

Affected: Internet Explorer (Microsoft) versions 11; Internet Explorer 11 versions >= 1.0.0. The full list is in the CVE brief.

Is CVE-2021-27085 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 12, 2021.

Is CVE-2021-27085 in the CISA KEV catalog?

Yes. It was added on Nov 3, 2021 with a federal remediation due date of Nov 17, 2021.

Is there a public exploit for CVE-2021-27085?

Public exploit code is available.

How urgently should CVE-2021-27085 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2021-27085

HighExploitedPublic exploit

Internet Explorer Remote Code Execution Vulnerability

Published Mar 10, 2021 · Updated Aug 19, 2026

Key Facts

Patch immediately

CVE-2021-27085 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Internet Explorer (Microsoft), Internet Explorer 11.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 12, 2021. Public exploit code is available.
EPSS estimates a 5.4% probability of exploitation in the next 30 days.
Fixed versions are available, including Internet Explorer 11 10.0.17134.2087, Internet Explorer 10.0.17134.2087, Internet Explorer publication.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

8.8

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

EPSS (30-day exploit likelihood)

5.4%

Higher than 92.6% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2021-27085 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Internet Explorer Remote Code Execution Vulnerability

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Nov 3, 2021	Nov 17, 2021	Not reported
Industry KEV feed	Mar 12, 2021	Nov 17, 2021	Not reported
CIRCL KEV	Nov 3, 2021	Nov 17, 2021	Not reported
ENISA EUVD	Nov 3, 2021	n/a	Not reported

Required action: Apply updates per vendor instructions.

Affected Products

3 affected entries in total

Product	Affected versions	Fixed in
Internet ExplorerMicrosoft	11	10.0.17134.2087
Internet Explorer 11	>= 1.0.0	10.0.17134.2087

Patched Releases

Internet Explorer 11

10.0.17134.2087

Internet Explorer

10.0.17134.2087, publication

Timeline

Publicly disclosed
Mar 10, 2021
Added to Industry KEV feed
Mar 12, 2021
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Aug 19, 2026

References

5 more references in the full CVE brief

FAQ

Common Questions.

Internet Explorer Remote Code Execution Vulnerability
Affected: Internet Explorer (Microsoft) versions 11; Internet Explorer 11 versions >= 1.0.0. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 12, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of Nov 17, 2021.
Public exploit code is available.
Fixed versions are available, including Internet Explorer 11 10.0.17134.2087, Internet Explorer 10.0.17134.2087, Internet Explorer publication.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2021-27085 Running On Your Attack Surface?

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