Is CVE-2021-27086 in the CISA KEV catalog?

No. CVE-2021-27086 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-27086?

CVE-2021-27086 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-27086?

CVE-2021-27086 has an EPSS score of 0.76% (51th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-27086?

Install KB5001339 for Windows 10 Version 1803. Fixes are available for 10 affected products.

CVE & CISA-KEV Catalog

CVE-2021-27086

HIGH

7.8

CVSS v3

NVD

Description

Windows Services and Controller App Elevation of Privilege Vulnerability

CWE-863Incorrect Authorization

How to fix

Remediation Available

Windows 10 Version 1803Windows

Install:KB5001339Microsoft

Windows 10 Version 1809Windows

Install:KB5001342Microsoft

Windows 10 Version 1909Windows

Install:KB5001337Microsoft

Windows 10 Version 2004Windows

Install:KB5001330Microsoft

Windows 10 Version 20H2Windows

Install:KB5001330Microsoft

Windows Server 2019Windows

Install:KB5001342Microsoft

Windows Server 2019 (Server Core installation)Windows

Install:KB5001342Microsoft

Windows Server, version 1909 (Server Core installation)Windows

Install:KB5001337Microsoft

Windows Server, version 2004 (Server Core installation)Windows

Install:KB5001330Microsoft

Windows Server, version 20H2 (Server Core Installation)Windows

Install:KB5001330Microsoft

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.76%probability of exploitation in 30 days

51stpercentile

Moderate risk: more likely to be exploited than 51% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

Third-Party Advisory1

packetstormsecurity.com

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2025-29927	Critical	9.1	100%	-	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2020-36289	Medium	5.3	99%	-	Fix

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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 2024-11-21.