CASCACascade Atlas

Evidence dossier

CVE-2021-43226

Windows Common Log File System Driver Elevation of Privilege Vulnerability

55.0–78.0Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

Windows Common Log File System Driver Elevation of Privilege Vulnerability

State
PUBLISHED
Published
Dec 15, 2021
Updated
Oct 21, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS3.07%

2026-07-18 · v2026.06.15 · percentile 86.2%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

microsoftoriginal assertion
container

Windows Common Log File System Driver Elevation of Privilege Vulnerability

CISA KEVoriginal assertion
observed_exploitation

Microsoft Windows Privilege Escalation Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.030720000000; percentile 0.861760000000

Applicability

Cited product scope

Trace impact →
MicrosoftWindows 10 Version 1507
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.10240.19145", "versionType": "custom"}]unknown
MicrosoftWindows 10 Version 1607
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.14393.4825", "versionType": "custom"}]unknown
MicrosoftWindows 10 Version 1809
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.17763.2366", "versionType": "custom"}]unknown
MicrosoftWindows 10 Version 1909
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.18363.1977", "versionType": "custom"}]unknown
MicrosoftWindows 10 Version 2004
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.19041.1415", "versionType": "custom"}]unknown
MicrosoftWindows 10 Version 20H2
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.19042.1415", "versionType": "custom"}]unknown
MicrosoftWindows 10 Version 21H1
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.19043.1415", "versionType": "custom"}]unknown
MicrosoftWindows 10 Version 21H2
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.19044.1415", "versionType": "custom"}]unknown
MicrosoftWindows 11 version 21H2
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.22000.376", "versionType": "custom"}]unknown
MicrosoftWindows 7
[{"status": "affected", "version": "6.1.0", "lessThan": "6.1.7601.25796", "versionType": "custom"}]unknown
MicrosoftWindows 7 Service Pack 1
[{"status": "affected", "version": "6.1.0", "lessThan": "6.1.7601.25796", "versionType": "custom"}]unknown
MicrosoftWindows 8.1
[{"status": "affected", "version": "6.3.0", "lessThan": "6.3.9600.20207", "versionType": "custom"}]unknown
MicrosoftWindows Server 2008 R2 Service Pack 1
[{"status": "affected", "version": "6.1.0", "lessThan": "6.1.7601.25796", "versionType": "custom"}]unknown
MicrosoftWindows Server 2008 R2 Service Pack 1 (Server Core installation)
[{"status": "affected", "version": "6.0.0", "lessThan": "6.1.7601.25796", "versionType": "custom"}]unknown
MicrosoftWindows Server 2008 Service Pack 2
[{"status": "affected", "version": "6.0.0", "lessThan": "6.0.6003.21309", "versionType": "custom"}]unknown
MicrosoftWindows Server 2008 Service Pack 2
[{"status": "affected", "version": "6.0.0", "lessThan": "6.0.6003.21309", "versionType": "custom"}]unknown
MicrosoftWindows Server 2008 Service Pack 2 (Server Core installation)
[{"status": "affected", "version": "6.0.0", "lessThan": "6.0.6003.21309", "versionType": "custom"}]unknown
MicrosoftWindows Server 2012
[{"status": "affected", "version": "6.2.0", "lessThan": "6.2.9200.23545", "versionType": "custom"}, {"status": "affected", "version": "6.2.0", "lessThan": "6.2.9200.23540", "versionType": "custom"}]unknown
MicrosoftWindows Server 2012 R2
[{"status": "affected", "version": "6.3.0", "lessThan": "6.3.9600.20207", "versionType": "custom"}]unknown
MicrosoftWindows Server 2012 R2 (Server Core installation)
[{"status": "affected", "version": "6.3.0", "lessThan": "6.3.9600.20207", "versionType": "custom"}]unknown
MicrosoftWindows Server 2012 (Server Core installation)
[{"status": "affected", "version": "6.2.0", "lessThan": "6.2.9200.23545", "versionType": "custom"}, {"status": "affected", "version": "6.2.0", "lessThan": "6.2.9200.23540", "versionType": "custom"}]unknown
MicrosoftWindows Server 2016
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.14393.4825", "versionType": "custom"}]unknown
MicrosoftWindows Server 2016 (Server Core installation)
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.14393.4825", "versionType": "custom"}]unknown
MicrosoftWindows Server 2019
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.17763.2366", "versionType": "custom"}]unknown
MicrosoftWindows Server 2019 (Server Core installation)
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.17763.2366", "versionType": "custom"}]unknown
MicrosoftWindows Server 2022
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.20348.405", "versionType": "custom"}]unknown
MicrosoftWindows Server version 2004
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.19041.1415", "versionType": "custom"}]unknown
MicrosoftWindows Server version 20H2
[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.19042.1415", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x64:*; end excluding 10.0.10240.19145supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x86:*; end excluding 10.0.10240.19145supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*; end excluding 10.0.14393.4825supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*; end excluding 10.0.14393.4825supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*; end excluding 10.0.17763.2366supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:*; end excluding 10.0.18363.1977supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*; end excluding 10.0.19041.1415supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.19042.1415supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:x86:*; end excluding 10.0.19042.1415supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:*; end excluding 10.0.19043.1415supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*; end excluding 10.0.19044.1415supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_21h2:*:*:*:*:*:*:*:*; end excluding 10.0.22000.376supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:*; end excluding 10.0.19041.1415supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x64:*supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x86:*supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*; end excluding 10.0.14393.4825supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*; end excluding 10.0.17763.2366supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*; end excluding 10.0.20348.405supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:*; end excluding 10.0.19042.1415supported

Assessments

CVSS by origin

7.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6
nvd@nist.govCVSS 2.0 · role PrimaryAV:L/AC:L/Au:N/C:P/I:P/A:P
7.8
secure@microsoft.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8
microsoftCVSS 3.1 · role unknownCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.