Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Evidence dossier
CVE-2026-21525
Windows Remote Access Connection Manager Denial of Service Vulnerability
60.0–75.0Priority evidence range
gen-56ccdaf9Normalized restatement
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
- State
- PUBLISHED
- Published
- Feb 10, 2026
- Updated
- May 11, 2026
- Evidence coverage
- 85%
2026-07-18 · v2026.06.15 · percentile 91.2%
Distinct CVSS assessments remain side by side; none are averaged.
Source comparison
Who said what
microsoftoriginal assertion
container
Windows Remote Access Connection Manager Denial of Service Vulnerability
Jul 19, 2026Original evidence ↗
CISA KEVoriginal assertion
observed_exploitation
Microsoft Windows NULL Pointer Dereference Vulnerability
Jul 19, 2026Original evidence ↗
FIRST EPSSoriginal assertion
model_probability
Probability 0.049560000000; percentile 0.912130000000
Jul 19, 2026Original evidence ↗
Applicability
Cited product scope
MicrosoftWindows 10 Version 1607
[{"status": "affected", "version": "10.0.14393.0", "lessThan": "10.0.14393.8868", "versionType": "custom"}]unknownMicrosoftWindows 10 Version 1809
[{"status": "affected", "version": "10.0.17763.0", "lessThan": "10.0.17763.8389", "versionType": "custom"}]unknownMicrosoftWindows 10 Version 21H2
[{"status": "affected", "version": "10.0.19044.0", "lessThan": "10.0.19044.6937", "versionType": "custom"}]unknownMicrosoftWindows 10 Version 22H2
[{"status": "affected", "version": "10.0.19045.0", "lessThan": "10.0.19045.6937", "versionType": "custom"}]unknownMicrosoftWindows 11 version 22H3
[{"status": "affected", "version": "10.0.22631.0", "lessThan": "10.0.22631.6649", "versionType": "custom"}]unknownMicrosoftWindows 11 Version 23H2
[{"status": "affected", "version": "10.0.22631.0", "lessThan": "10.0.22631.6649", "versionType": "custom"}]unknownMicrosoftWindows 11 Version 24H2
[{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.7840", "versionType": "custom"}]unknownMicrosoftWindows 11 Version 25H2
[{"status": "affected", "version": "10.0.26200.0", "lessThan": "10.0.26200.7840", "versionType": "custom"}]unknownMicrosoftWindows 11 version 26H1
[{"status": "affected", "version": "10.0.28000.0", "lessThan": "10.0.28000.1575", "versionType": "custom"}]unknownMicrosoftWindows 11 Version 26H1
[{"status": "affected", "version": "10.0.28000.0", "lessThan": "10.0.28000.1575", "versionType": "custom"}]unknownMicrosoftWindows Server 2012
[{"status": "affected", "version": "6.2.9200.0", "lessThan": "6.2.9200.25923", "versionType": "custom"}]unknownMicrosoftWindows Server 2012 R2
[{"status": "affected", "version": "6.3.9600.0", "lessThan": "6.3.9600.23022", "versionType": "custom"}]unknownMicrosoftWindows Server 2012 R2 (Server Core installation)
[{"status": "affected", "version": "6.3.9600.0", "lessThan": "6.3.9600.23022", "versionType": "custom"}]unknownMicrosoftWindows Server 2012 (Server Core installation)
[{"status": "affected", "version": "6.2.9200.0", "lessThan": "6.2.9200.25923", "versionType": "custom"}]unknownMicrosoftWindows Server 2016
[{"status": "affected", "version": "10.0.14393.0", "lessThan": "10.0.14393.8868", "versionType": "custom"}]unknownMicrosoftWindows Server 2016 (Server Core installation)
[{"status": "affected", "version": "10.0.14393.0", "lessThan": "10.0.14393.8868", "versionType": "custom"}]unknownMicrosoftWindows Server 2019
[{"status": "affected", "version": "10.0.17763.0", "lessThan": "10.0.17763.8389", "versionType": "custom"}]unknownMicrosoftWindows Server 2019 (Server Core installation)
[{"status": "affected", "version": "10.0.17763.0", "lessThan": "10.0.17763.8389", "versionType": "custom"}]unknownMicrosoftWindows Server 2022
[{"status": "affected", "version": "10.0.20348.0", "lessThan": "10.0.20348.4773", "versionType": "custom"}]unknownMicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)
[{"status": "affected", "version": "10.0.25398.0", "lessThan": "10.0.25398.2149", "versionType": "custom"}]unknownMicrosoftWindows Server 2025
[{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.32370", "versionType": "custom"}]unknownMicrosoftWindows Server 2025 (Server Core installation)
[{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.32370", "versionType": "custom"}]unknownUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*; end excluding 10.0.14393.8868supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*; end excluding 10.0.14393.8868supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*; end excluding 10.0.17763.8389supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*; end excluding 10.0.17763.8389supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.19044.6937supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*; end excluding 10.0.19044.6937supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*; end excluding 10.0.19044.6937supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.19045.6937supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*; end excluding 10.0.19045.6937supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*; end excluding 10.0.19045.6937supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.22631.6649supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*; end excluding 10.0.22631.6649supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.26100.7781supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*; end excluding 10.0.26100.7781supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.26200.7781supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*; end excluding 10.0.26200.7781supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*; end excluding 10.0.14393.8868supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*; end excluding 10.0.17763.8389supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*; end excluding 10.0.20348.4711supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*; end excluding 10.0.25398.2149supportedUnknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*; end excluding 10.0.26100.32313supportedAssessments
CVSS by origin
secure@microsoft.comCVSS 3.1 · role Secondary
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HmicrosoftCVSS 3.1 · role unknown
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:CLimitations 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.