Is CVE-2021-31977 in the CISA KEV catalog?

No. CVE-2021-31977 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-31977?

CVE-2021-31977 has a CVSS v3 base score of 8.6 (HIGH).

What is the EPSS score for CVE-2021-31977?

CVE-2021-31977 has an EPSS score of 3.18% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-31977?

Install KB5003687 for Windows 10. Fixes are available for 12 affected products.

CVE & CISA-KEV Catalog

CVE-2021-31977

HIGHEPSS 87th pctl

8.6

CVSS v3

NVD

Description

Windows Hyper-V Denial of Service Vulnerability

CWE-119Buffer Overflow

How to fix

Remediation Available

Windows 10Windows

Install:KB5003687Microsoft

Windows 10 Version 1607Windows

Install:KB5003638Microsoft

Windows 10 Version 1809Windows

Install:KB5003646Microsoft

Windows 10 Version 1909Windows

Install:KB5003635Microsoft

Windows 10 Version 2004Windows

Install:KB5003637Microsoft

Windows 10 Version 21H1Windows

Install:KB5003637Microsoft

Windows Server 2016Windows

Install:KB5003638Microsoft

Windows Server 2016 (Server Core installation)Windows

Install:KB5003638Microsoft

Windows Server 2019Windows

Install:KB5003646Microsoft

Windows Server 2019 (Server Core installation)Windows

Install:KB5003646Microsoft

Windows Server, version 2004 (Server Core installation)Windows

Install:KB5003637Microsoft

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

Install:KB5003637Microsoft

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

3.18%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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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.