CRITICAL
Windows Secure Socket Tunneling Protocol (SSTP) Remote Code Execution Vulnerability
Published Sep 8, 2026
9.8
CRITICALCVSS 3.1
EPSS 0.97%
Description
Use after free in Windows Secure Socket Tunneling Protocol (SSTP) allows an unauthorized attacker to execute code over a network.
Affected products
-
- Version 10.0.14393.0StatusaffectedConstraints<10.0.14393.9512
- Version
-
- Version 10.0.17763.0StatusaffectedConstraints<10.0.17763.9245
- Version
-
- Version 10.0.19044.0StatusaffectedConstraints<10.0.19044.7725
- Version
-
- Version 10.0.19045.0StatusaffectedConstraints<10.0.19045.7725
- Version
-
- Version 10.0.22631.0StatusaffectedConstraints<10.0.22631.7582
- Version
-
- Version 10.0.26100.0StatusaffectedConstraints<10.0.26100.9445
- Version
-
- Version 10.0.26200.0StatusaffectedConstraints<10.0.26200.9445
- Version
-
- Version 10.0.22631.0StatusaffectedConstraints<10.0.22631.7582
- Version
-
- Version 10.0.28000.0StatusaffectedConstraints<10.0.28000.2954
- Version
-
- Version 6.2.9200.0StatusaffectedConstraints<6.2.9200.26349
- Version
-
- Version 6.2.9200.0StatusaffectedConstraints<6.2.9200.26349
- Version
-
- Version 6.3.9600.0StatusaffectedConstraints<6.3.9600.23398
- Version
-
- Version 6.3.9600.0StatusaffectedConstraints<6.3.9600.23398
- Version
-
- Version 10.0.14393.0StatusaffectedConstraints<10.0.14393.9512
- Version
-
- Version 10.0.14393.0StatusaffectedConstraints<10.0.14393.9512
- Version
-
- Version 10.0.17763.0StatusaffectedConstraints<10.0.17763.9245
- Version
-
- Version 10.0.17763.0StatusaffectedConstraints<10.0.17763.9245
- Version
-
- Version 10.0.20348.0StatusaffectedConstraints<10.0.20348.5622
- Version
-
- Version 10.0.26100.0StatusaffectedConstraints<10.0.26100.33438
- Version
-
- Version 10.0.26100.0StatusaffectedConstraints<10.0.26100.33438
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 | n/a |
| ||||||
| Microsoft | Windows 10 Version 1809 | n/a |
| ||||||
| Microsoft | Windows 10 Version 21H2 | n/a |
| ||||||
| Microsoft | Windows 10 Version 22H2 | n/a |
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| Microsoft | Windows 11 Version 23H2 | n/a |
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| Microsoft | Windows 11 Version 24H2 | n/a |
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| Microsoft | Windows 11 Version 25H2 | n/a |
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| Microsoft | Windows 11 version 23H2 | n/a |
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| Microsoft | Windows 11 version 26H1 | n/a |
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| Microsoft | Windows Server 2012 | n/a |
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| Microsoft | Windows Server 2012 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2012 R2 | n/a |
| ||||||
| Microsoft | Windows Server 2012 R2 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2016 | n/a |
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| Microsoft | Windows Server 2016 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2019 | n/a |
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| Microsoft | Windows Server 2019 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2022 | n/a |
| ||||||
| Microsoft | Windows Server 2025 | n/a |
| ||||||
| Microsoft | Windows Server 2025 (Server Core installation) | n/a |
|
OR
- < 10.0.14393.9512
- < 10.0.14393.9512
- < 10.0.17763.9245
- < 10.0.17763.9245
- < 10.0.19044.7725
- < 10.0.19044.7725
- < 10.0.19044.7725
- < 10.0.19045.7725
- < 10.0.19045.7725
- < 10.0.19045.7725
- < 10.0.22631.7582
- < 10.0.22631.7582
- < 10.0.26100.9445
- < 10.0.26100.9445
- < 10.0.26200.9445
- < 10.0.26200.9445
- < 10.0.28000.2954
- < 10.0.28000.2954
- n/a
- r2
- < 10.0.14393.9512
- < 10.0.17763.9245
- < 10.0.20348.5622
- < 10.0.26100.33438
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
9.8 CRITICAL CVE.org
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
Exploit Maturity Unreported
1 other source (NVD) ▾
9.8 CRITICAL NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed Sep 9, 2026 · SSVC 2.0.3
0.97% 0.00974
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.00974
Score over time
Sep–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.97% (0.00974) | 60.69th | v5 (v2026.06.15) |
| Sep 9, 2026 | 0.91% (0.00909) | 57.85th | v5 (v2026.06.15) |
Weaknesses (1)
References (1)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-73009 vendor-advisorypatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-73009 | vendor-advisorypatchVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner microsoft
Published Sep 8, 2026
Updated Oct 1, 2026
Reserved Aug 10, 2026
Link CVE-2026-73009
CISA Vulnrichment
Updated Sep 9, 2026