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

Yes. CVE-2021-27085 is on the CISA Known Exploited Vulnerabilities list, added 2021-11-03.

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

CVE-2021-27085 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-27085?

CVE-2021-27085 has an EPSS score of 3.71% (88th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2021-27085

HIGHCISA KEVEPSS 88th pctl

8.8

CVSS v3

NVD

Description

Internet Explorer Remote Code Execution Vulnerability

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityHigh

AvailabilityLow

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

Exploit Intelligence

3.71%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Internet Explorer Remote Code Execution Vulnerability

Microsoft Internet Explorer contains an unspecified vulnerability that allows for remote code execution.

Apply updates per vendor instructions.

Remediation due: 2021-11-17

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-30.