CVE-2022-26784 — Windows Cluster Shared Volume (CSV) Denial of Service Vulnerability

Executive Summary

None

Overview

6.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Denial of Service

Released Apr 12 2022

Last Updated Apr 12 2022

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.02159 — 0.79831 percentile

NVD CVSS 6.5 MEDIUM — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

None

INTEGRITY

None

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 5.7

EPSS Score

0.02159

probability of exploitation in the next 30 days

0.79831 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

7 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows Server 2012 5012650 (Monthly Rollup) 5012666 (Security Only) Important Denial of Service 5011535 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.2.9200.23679 Yes 5012650 5012666 Windows Server 2012 (Server Core installation) 5012650 (Monthly Rollup) 5012666 (Security Only) Important Denial of Service 5011535 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.2.9200.23679 Yes 5012650 5012666 Windows Server 2012 R2 5012670 (Monthly Rollup) 5012639 (Security Only) Important Denial of Service 5011564 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.3.9600.20337 Yes 5012670 5012639 Windows Server 2012 R2 (Server Core installation) 5012670 (Monthly Rollup) 5012639 (Security Only) Important Denial of Service 5011564 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.3.9600.20337 Yes 5012670 5012639 Windows Server 2016	`5012596 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2016 (Server Core installation)	`5012596 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2019	`5012647 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2019 (Server Core installation)	`5012647 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2022	`5012604 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2022 (Server Core installation)	`5012604 (Security Update)`	Important	Denial of Service	Yes
Windows Server, version 20H2 (Server Core Installation)	`5012599 (Security Update)`	Important	Denial of Service	Yes

Patches

4 patches

Article	Type	Restart
`5012596`	Security Update	Yes
`5012647`	Security Update	Yes
`5012604`	Security Update	Yes
`5012599`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

k0shl with Kunlun Lab

References

MSRC Advisory MITRE NVD