Windows Network Connection Broker Elevation of Privilege Vulnerability
Double free in Windows Network Connection Broker allows an authorized attacker to elevate privileges locally.
- Published
- Aug 11, 2026
- Updated
- Sep 29, 2026
- EPSS
- 0.3% · 16th percentile
- CWE
- CWE-415
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Report tools
Action score
28
Monitor
Low priority for now.
- CVSS
- 28 / 40 · 7.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · microsoft
- 7.0
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| microsoft | windows 10 1607 | cpe:2.3:o:microsoft:windows_10_1607 |
| microsoft | windows 10 1809 | cpe:2.3:o:microsoft:windows_10_1809 |
| microsoft | windows 10 21h2 | cpe:2.3:o:microsoft:windows_10_21h2 |
| microsoft | windows 10 22h2 | cpe:2.3:o:microsoft:windows_10_22h2 |
| microsoft | windows 11 23h2 | cpe:2.3:o:microsoft:windows_11_23h2 |
| microsoft | windows 11 24h2 | cpe:2.3:o:microsoft:windows_11_24h2 |
| microsoft | windows 11 25h2 | cpe:2.3:o:microsoft:windows_11_25h2 |
| microsoft | windows 11 26h1 | cpe:2.3:o:microsoft:windows_11_26h1 |
| microsoft | windows server 2012 | cpe:2.3:o:microsoft:windows_server_2012 |
| microsoft | windows server 2016 | cpe:2.3:o:microsoft:windows_server_2016 |
| microsoft | windows server 2019 | cpe:2.3:o:microsoft:windows_server_2019 |
| microsoft | windows server 2022 | cpe:2.3:o:microsoft:windows_server_2022 |
and 1 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- microsoft windows server 2012all versions
- microsoft windows server 2012r2
- microsoft windows server 2016before 10.0.14393.9418
- microsoft windows server 2019before 10.0.17763.9115
- microsoft windows server 2022before 10.0.20348.5440
- microsoft windows server 2025before 10.0.26100.33222
Versions reported by the vendor
Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.
Microsoft Windows 10 Version 1607
- 10.0.14393.0 and later · before 10.0.14393.9418affected
Microsoft Windows 10 Version 1809
- 10.0.17763.0 and later · before 10.0.17763.9121affected
Microsoft Windows 10 Version 21H2
- 10.0.19044.0 and later · before 10.0.19044.7663affected
Microsoft Windows 10 Version 22H2
- 10.0.19045.0 and later · before 10.0.19045.7663affected
Microsoft Windows 11 version 23H2
- 10.0.22631.0 and later · before 10.0.22631.7517affected
Microsoft Windows 11 Version 23H2
- 10.0.22631.0 and later · before 10.0.22631.7517affected
Microsoft Windows 11 Version 24H2
- 10.0.26100.0 and later · before 10.0.26100.9168affected
Microsoft Windows 11 Version 25H2
- 10.0.26200.0 and later · before 10.0.26200.9168affected
Microsoft Windows 11 version 26H1
- 10.0.28000.0 and later · before 10.0.28000.2704affected
Microsoft Windows Server 2012
- 6.2.9200.0 and later · before 6.2.9200.26280affected
Microsoft Windows Server 2012 (Server Core installation)
- 6.2.9200.0 and later · before 6.2.9200.26280affected
Microsoft Windows Server 2012 R2
- 6.3.9600.0 and later · before 6.3.9600.23338affected
Same product
microsoft: all recordsOther highest-scoring records for the same primary product.
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- CVE-2026-33824Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution VulnerabilityKEV69This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Windows 10 Version 1607 for 32-bit Systems | 10.0.14393.9418 · KB5120418 | Microsoft (MSRC) |
| Windows 10 Version 1607 for x64-based Systems | 10.0.14393.9418 · KB5120418 | Microsoft (MSRC) |
| Windows 10 Version 1809 for 32-bit Systems | 10.0.17763.9121 · KB5120238 | Microsoft (MSRC) |
| Windows 10 Version 1809 for x64-based Systems | 10.0.17763.9121 · KB5120238 | Microsoft (MSRC) |
| Windows 10 Version 21H2 for 32-bit Systems | 10.0.19044.7663 · KB5120249 | Microsoft (MSRC) |
| Windows 10 Version 21H2 for ARM64-based Systems | 10.0.19044.7663 · KB5120249 | Microsoft (MSRC) |
| Windows 10 Version 21H2 for x64-based Systems | 10.0.19044.7663 · KB5120249 | Microsoft (MSRC) |
| Windows 10 Version 22H2 for 32-bit Systems | 10.0.19045.7663 · KB5120249 | Microsoft (MSRC) |
| Windows 10 Version 22H2 for ARM64-based Systems | 10.0.19045.7663 · KB5120249 | Microsoft (MSRC) |
| Windows 10 Version 22H2 for x64-based Systems | 10.0.19045.7663 · KB5120249 | Microsoft (MSRC) |
| Windows 11 Version 23H2 for ARM64-based Systems | 10.0.22631.7517 · KB5120240 | Microsoft (MSRC) |
| Windows 11 Version 23H2 for x64-based Systems | 10.0.22631.7517 · KB5120240 | Microsoft (MSRC) |
| Windows 11 Version 24H2 for ARM64-based Systems | 10.0.26100.9106 · KB5120994 | Microsoft (MSRC) |
| Windows 11 Version 24H2 for ARM64-based Systems | 10.0.26100.9168 · KB5121003 | Microsoft (MSRC) |
| Windows 11 Version 24H2 for x64-based Systems | 10.0.26100.9106 · KB5120994 | Microsoft (MSRC) |
| Windows 11 Version 24H2 for x64-based Systems | 10.0.26100.9168 · KB5121003 | Microsoft (MSRC) |
| Windows 11 Version 25H2 for ARM64-based Systems | 10.0.26200.9106 · KB5120994 | Microsoft (MSRC) |
| Windows 11 Version 25H2 for ARM64-based Systems | 10.0.26200.9168 · KB5121003 | Microsoft (MSRC) |
| Windows 11 Version 25H2 for x64-based Systems | 10.0.26200.9106 · KB5120994 | Microsoft (MSRC) |
| Windows 11 Version 25H2 for x64-based Systems | 10.0.26200.9168 · KB5121003 | Microsoft (MSRC) |
| Windows 11 Version 26H1 for ARM64-based Systems | 10.0.28000.2704 · KB5121000 | Microsoft (MSRC) |
| Windows 11 version 26H1 for x64-based Systems | 10.0.28000.2704 · KB5121000 | Microsoft (MSRC) |
| Windows Server 2012 | 6.2.9200.26280 · KB5120386 | Microsoft (MSRC) |
| Windows Server 2012 (Server Core installation) | 6.2.9200.26280 · KB5120386 | Microsoft (MSRC) |
| Windows Server 2012 R2 | 6.3.9600.23338 · KB5120385 | Microsoft (MSRC) |
| Windows Server 2012 R2 (Server Core installation) | 6.3.9600.23338 · KB5120385 | Microsoft (MSRC) |
| Windows Server 2016 | 10.0.14393.9418 · KB5120418 | Microsoft (MSRC) |
| Windows Server 2016 (Server Core installation) | 10.0.14393.9418 · KB5120418 | Microsoft (MSRC) |
| Windows Server 2019 | 10.0.17763.9121 · KB5120238 | Microsoft (MSRC) |
| Windows Server 2019 (Server Core installation) | 10.0.17763.9121 · KB5120238 | Microsoft (MSRC) |
+8
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-33824119 days apartWindows Internet Key Exchange (IKE) Service Extensions Remote Code Execution VulnerabilityKEV69This week
- CVE-2026-7749328 days apartWindows Graphics Component Remote Code Execution Vulnerability39Monitor
- CVE-2026-7750428 days apartMicrosoft Office Word Remote Code Execution Vulnerability35Monitor
- CVE-2026-628890 days apartWindows Secure Socket Tunneling Protocol (SSTP) Remote Code Execution Vulnerability32Monitor
- CVE-2026-6987628 days apartWindows DHCP Server Remote Code Execution Vulnerability32Monitor
- CVE-2026-5500428 days apartWindows Print Configuration Elevation of Privilege Vulnerability31Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-415 · Double FreeCVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.