CVE-2021-27085

Microsoft Internet Explorer Remote Code Execution

8.8 HIGHActively exploited (CISA KEV)EPSS 5.45%

Published11 Mar 2021
Added to CISA KEV3 Nov 2021
Remediation due17 Nov 2021

Description

Internet Explorer Remote Code Execution Vulnerability

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionRequired

ScopeChanged

ConfidentialityLow

IntegrityHigh

AvailabilityLow

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

Affected products

Microsoft Internet Explorer11

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

Patch & vendor advisories

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27085PatchVendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27085PatchVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27085US Government Resource

Frequently asked

Is CVE-2021-27085 being actively exploited?

Yes. CVE-2021-27085 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021.

How severe is CVE-2021-27085?

CVE-2021-27085 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 5.45% probability of exploitation.

Which products are affected by CVE-2021-27085?

Affected products include Microsoft Internet Explorer.

How do I fix CVE-2021-27085?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-27085 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.