MSRC_CVE-2026-34341
Vulnerability from csaf_microsoft - Published: 2026-05-12 07:00 - Updated: 2026-05-12 07:00Summary
Windows Link-Layer Discovery Protocol (LLDP) Elevation of Privilege Vulnerability
Severity
Important
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Customer Action: Required. The vulnerability documented by this CVE requires customer action to resolve.
CWE-415
- Double Free
Affected products
Fixed
31 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows Server 2012 6.2.9200.26079
Windows Server 2012
|
6.2.9200.26079 | ||
|
Windows Server 2012 (Server Core installation) 6.2.9200.26079
Windows Server 2012 (Server Core installation)
|
6.2.9200.26079 | ||
|
Windows Server 2012 R2 6.3.9600.23181
Windows Server 2012 R2
|
6.3.9600.23181 | ||
|
Windows Server 2012 R2 (Server Core installation) 6.3.9600.23181
Windows Server 2012 R2 (Server Core installation)
|
6.3.9600.23181 | ||
|
Windows Server 2016 10.0.14393.9140
Windows Server 2016
|
10.0.14393.9140 | ||
|
Windows 10 Version 1607 for 32-bit Systems 10.0.14393.9140
Windows 10 Version 1607 for 32-bit Systems
|
10.0.14393.9140 | ||
|
Windows 10 Version 1607 for x64-based Systems 10.0.14393.9140
Windows 10 Version 1607 for x64-based Systems
|
10.0.14393.9140 | ||
|
Windows Server 2016 (Server Core installation) 10.0.14393.9140
Windows Server 2016 (Server Core installation)
|
10.0.14393.9140 | ||
|
Windows 10 Version 1809 for 32-bit Systems 10.0.17763.8755
Windows 10 Version 1809 for 32-bit Systems
|
10.0.17763.8755 | ||
|
Windows 10 Version 1809 for x64-based Systems 10.0.17763.8755
Windows 10 Version 1809 for x64-based Systems
|
10.0.17763.8755 | ||
|
Windows Server 2019 10.0.17763.8755
Windows Server 2019
|
10.0.17763.8755 | ||
|
Windows Server 2019 (Server Core installation) 10.0.17763.8755
Windows Server 2019 (Server Core installation)
|
10.0.17763.8755 | ||
|
Windows Server 2022 10.0.20348.5139
Windows Server 2022
|
10.0.20348.5139 | ||
|
Windows Server 2022 (Server Core installation) 10.0.20348.5139
Windows Server 2022 (Server Core installation)
|
10.0.20348.5139 | ||
|
Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.7291
Windows 10 Version 21H2 for 32-bit Systems
|
10.0.19044.7291 | ||
|
Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.7291
Windows 10 Version 21H2 for ARM64-based Systems
|
10.0.19044.7291 | ||
|
Windows 10 Version 21H2 for x64-based Systems 10.0.19044.7291
Windows 10 Version 21H2 for x64-based Systems
|
10.0.19044.7291 | ||
|
Windows 10 Version 22H2 for x64-based Systems 10.0.19045.7291
Windows 10 Version 22H2 for x64-based Systems
|
10.0.19045.7291 | ||
|
Windows 10 Version 22H2 for ARM64-based Systems 10.0.19045.7291
Windows 10 Version 22H2 for ARM64-based Systems
|
10.0.19045.7291 | ||
|
Windows 10 Version 22H2 for 32-bit Systems 10.0.19045.7291
Windows 10 Version 22H2 for 32-bit Systems
|
10.0.19045.7291 | ||
|
Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.7079
Windows 11 Version 23H2 for ARM64-based Systems
|
10.0.22631.7079 | ||
|
Windows 11 Version 23H2 for x64-based Systems 10.0.22631.7079
Windows 11 Version 23H2 for x64-based Systems
|
10.0.22631.7079 | ||
|
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2330
Windows Server 2022, 23H2 Edition (Server Core installation)
|
10.0.25398.2330 | ||
|
Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.8457
Windows 11 Version 24H2 for ARM64-based Systems
|
10.0.26100.8457 | ||
|
Windows 11 Version 24H2 for x64-based Systems 10.0.26100.8457
Windows 11 Version 24H2 for x64-based Systems
|
10.0.26100.8457 | ||
|
Windows Server 2025 10.0.26100.32860
Windows Server 2025
|
10.0.26100.32860 | ||
|
Windows Server 2025 (Server Core installation) 10.0.26100.32860
Windows Server 2025 (Server Core installation)
|
10.0.26100.32860 | ||
|
Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.8457
Windows 11 Version 25H2 for ARM64-based Systems
|
10.0.26200.8457 | ||
|
Windows 11 Version 25H2 for x64-based Systems 10.0.26200.8457
Windows 11 Version 25H2 for x64-based Systems
|
10.0.26200.8457 | ||
|
Windows 11 version 26H1 for x64-based Systems 10.0.28000.2113
Windows 11 version 26H1 for x64-based Systems
|
10.0.28000.2113 | ||
|
Windows 11 Version 26H1 for ARM64-based Systems 10.0.28000.2113
Windows 11 Version 26H1 for ARM64-based Systems
|
10.0.28000.2113 |
Known affected
31 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows 11 Version 26H1 for ARM64-based Systems <10.0.28000.2113
Windows 11 Version 26H1 for ARM64-based Systems
|
<10.0.28000.2113 |
Vendor Fix
fix
|
|
|
Windows 11 version 26H1 for x64-based Systems <10.0.28000.2113
Windows 11 version 26H1 for x64-based Systems
|
<10.0.28000.2113 |
Vendor Fix
fix
|
|
|
Windows 11 Version 25H2 for x64-based Systems <10.0.26200.8457
Windows 11 Version 25H2 for x64-based Systems
|
<10.0.26200.8457 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows 11 Version 25H2 for ARM64-based Systems <10.0.26200.8457
Windows 11 Version 25H2 for ARM64-based Systems
|
<10.0.26200.8457 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows Server 2025 (Server Core installation) <10.0.26100.32860
Windows Server 2025 (Server Core installation)
|
<10.0.26100.32860 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows Server 2025 <10.0.26100.32860
Windows Server 2025
|
<10.0.26100.32860 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows 11 Version 24H2 for x64-based Systems <10.0.26100.8457
Windows 11 Version 24H2 for x64-based Systems
|
<10.0.26100.8457 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows 11 Version 24H2 for ARM64-based Systems <10.0.26100.8457
Windows 11 Version 24H2 for ARM64-based Systems
|
<10.0.26100.8457 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows Server 2022, 23H2 Edition (Server Core installation) <10.0.25398.2330
Windows Server 2022, 23H2 Edition (Server Core installation)
|
<10.0.25398.2330 |
Vendor Fix
fix
|
|
|
Windows 11 Version 23H2 for x64-based Systems <10.0.22631.7079
Windows 11 Version 23H2 for x64-based Systems
|
<10.0.22631.7079 |
Vendor Fix
fix
|
|
|
Windows 11 Version 23H2 for ARM64-based Systems <10.0.22631.7079
Windows 11 Version 23H2 for ARM64-based Systems
|
<10.0.22631.7079 |
Vendor Fix
fix
|
|
|
Windows 10 Version 22H2 for 32-bit Systems <10.0.19045.7291
Windows 10 Version 22H2 for 32-bit Systems
|
<10.0.19045.7291 |
Vendor Fix
fix
|
|
|
Windows 10 Version 22H2 for ARM64-based Systems <10.0.19045.7291
Windows 10 Version 22H2 for ARM64-based Systems
|
<10.0.19045.7291 |
Vendor Fix
fix
|
|
|
Windows 10 Version 22H2 for x64-based Systems <10.0.19045.7291
Windows 10 Version 22H2 for x64-based Systems
|
<10.0.19045.7291 |
Vendor Fix
fix
|
|
|
Windows 10 Version 21H2 for x64-based Systems <10.0.19044.7291
Windows 10 Version 21H2 for x64-based Systems
|
<10.0.19044.7291 |
Vendor Fix
fix
|
|
|
Windows 10 Version 21H2 for ARM64-based Systems <10.0.19044.7291
Windows 10 Version 21H2 for ARM64-based Systems
|
<10.0.19044.7291 |
Vendor Fix
fix
|
|
|
Windows 10 Version 21H2 for 32-bit Systems <10.0.19044.7291
Windows 10 Version 21H2 for 32-bit Systems
|
<10.0.19044.7291 |
Vendor Fix
fix
|
|
|
Windows Server 2022 (Server Core installation) <10.0.20348.5139
Windows Server 2022 (Server Core installation)
|
<10.0.20348.5139 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows Server 2022 <10.0.20348.5139
Windows Server 2022
|
<10.0.20348.5139 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows Server 2019 (Server Core installation) <10.0.17763.8755
Windows Server 2019 (Server Core installation)
|
<10.0.17763.8755 |
Vendor Fix
fix
|
|
|
Windows Server 2019 <10.0.17763.8755
Windows Server 2019
|
<10.0.17763.8755 |
Vendor Fix
fix
|
|
|
Windows 10 Version 1809 for x64-based Systems <10.0.17763.8755
Windows 10 Version 1809 for x64-based Systems
|
<10.0.17763.8755 |
Vendor Fix
fix
|
|
|
Windows 10 Version 1809 for 32-bit Systems <10.0.17763.8755
Windows 10 Version 1809 for 32-bit Systems
|
<10.0.17763.8755 |
Vendor Fix
fix
|
|
|
Windows Server 2016 (Server Core installation) <10.0.14393.9140
Windows Server 2016 (Server Core installation)
|
<10.0.14393.9140 |
Vendor Fix
fix
|
|
|
Windows 10 Version 1607 for x64-based Systems <10.0.14393.9140
Windows 10 Version 1607 for x64-based Systems
|
<10.0.14393.9140 |
Vendor Fix
fix
|
|
|
Windows 10 Version 1607 for 32-bit Systems <10.0.14393.9140
Windows 10 Version 1607 for 32-bit Systems
|
<10.0.14393.9140 |
Vendor Fix
fix
|
|
|
Windows Server 2016 <10.0.14393.9140
Windows Server 2016
|
<10.0.14393.9140 |
Vendor Fix
fix
|
|
|
Windows Server 2012 R2 (Server Core installation) <6.3.9600.23181
Windows Server 2012 R2 (Server Core installation)
|
<6.3.9600.23181 |
Vendor Fix
fix
|
|
|
Windows Server 2012 R2 <6.3.9600.23181
Windows Server 2012 R2
|
<6.3.9600.23181 |
Vendor Fix
fix
|
|
|
Windows Server 2012 (Server Core installation) <6.2.9200.26079
Windows Server 2012 (Server Core installation)
|
<6.2.9200.26079 |
Vendor Fix
fix
|
|
|
Windows Server 2012 <6.2.9200.26079
Windows Server 2012
|
<6.2.9200.26079 |
Vendor Fix
fix
|
Threats
Impact
Elevation of Privilege
Exploit Status
Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
References
7 references
Acknowledgments
hazard
{
"document": {
"acknowledgments": [
{
"names": [
"hazard"
]
}
],
"aggregate_severity": {
"namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
"text": "Important"
},
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Public",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en-US",
"notes": [
{
"category": "general",
"text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
"title": "Additional Resources"
},
{
"category": "legal_disclaimer",
"text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
"title": "Disclaimer"
},
{
"category": "general",
"text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
"title": "Customer Action"
}
],
"publisher": {
"category": "vendor",
"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"references": [
{
"category": "self",
"summary": "CVE-2026-34341 Windows Link-Layer Discovery Protocol (LLDP) Elevation of Privilege Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34341"
},
{
"category": "self",
"summary": "CVE-2026-34341 Windows Link-Layer Discovery Protocol (LLDP) Elevation of Privilege Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-34341.json"
},
{
"category": "external",
"summary": "Microsoft Exploitability Index",
"url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
},
{
"category": "external",
"summary": "Microsoft Support Lifecycle",
"url": "https://support.microsoft.com/lifecycle"
},
{
"category": "external",
"summary": "Common Vulnerability Scoring System",
"url": "https://www.first.org/cvss"
}
],
"title": "Windows Link-Layer Discovery Protocol (LLDP) Elevation of Privilege Vulnerability",
"tracking": {
"current_release_date": "2026-05-12T07:00:00.000Z",
"generator": {
"date": "2026-05-12T17:08:13.611Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2026-34341",
"initial_release_date": "2026-05-12T07:00:00.000Z",
"revision_history": [
{
"date": "2026-05-12T07:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
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"name": "\u003c10.0.17763.8755",
"product": {
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"product_id": "23"
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{
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"product": {
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"category": "product_name",
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{
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"product_id": "22"
}
},
{
"category": "product_version",
"name": "10.0.17763.8755",
"product": {
"name": "Windows 10 Version 1809 for x64-based Systems 10.0.17763.8755",
"product_id": "11569"
}
}
],
"category": "product_name",
"name": "Windows 10 Version 1809 for x64-based Systems"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.17763.8755",
"product": {
"name": "Windows Server 2019 \u003c10.0.17763.8755",
"product_id": "21"
}
},
{
"category": "product_version",
"name": "10.0.17763.8755",
"product": {
"name": "Windows Server 2019 10.0.17763.8755",
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"product_id": "20"
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},
{
"category": "product_version",
"name": "10.0.17763.8755",
"product": {
"name": "Windows Server 2019 (Server Core installation) 10.0.17763.8755",
"product_id": "11572"
}
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],
"category": "product_name",
"name": "Windows Server 2019 (Server Core installation)"
},
{
"branches": [
{
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"product_id": "19"
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},
{
"category": "product_version",
"name": "10.0.20348.5139",
"product": {
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"product_id": "18"
}
},
{
"category": "product_version",
"name": "10.0.20348.5139",
"product": {
"name": "Windows Server 2022 (Server Core installation) 10.0.20348.5139",
"product_id": "11924"
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"category": "product_name",
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{
"category": "product_version",
"name": "10.0.19044.7291",
"product": {
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"product_id": "16"
}
},
{
"category": "product_version",
"name": "10.0.19044.7291",
"product": {
"name": "Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.7291",
"product_id": "11930"
}
}
],
"category": "product_name",
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{
"category": "product_version",
"name": "10.0.19044.7291",
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{
"category": "product_version",
"name": "10.0.19045.7291",
"product": {
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"category": "product_name",
"name": "Windows 10 Version 22H2 for x64-based Systems"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.19045.7291",
"product": {
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"product_id": "13"
}
},
{
"category": "product_version",
"name": "10.0.19045.7291",
"product": {
"name": "Windows 10 Version 22H2 for ARM64-based Systems 10.0.19045.7291",
"product_id": "12098"
}
}
],
"category": "product_name",
"name": "Windows 10 Version 22H2 for ARM64-based Systems"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.19045.7291",
"product": {
"name": "Windows 10 Version 22H2 for 32-bit Systems \u003c10.0.19045.7291",
"product_id": "12"
}
},
{
"category": "product_version",
"name": "10.0.19045.7291",
"product": {
"name": "Windows 10 Version 22H2 for 32-bit Systems 10.0.19045.7291",
"product_id": "12099"
}
}
],
"category": "product_name",
"name": "Windows 10 Version 22H2 for 32-bit Systems"
},
{
"branches": [
{
"category": "product_version_range",
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"product": {
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"product_id": "5"
}
},
{
"category": "product_version",
"name": "10.0.26100.32860",
"product": {
"name": "Windows Server 2025 (Server Core installation) 10.0.26100.32860",
"product_id": "12437"
}
}
],
"category": "product_name",
"name": "Windows Server 2025 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26200.8457",
"product": {
"name": "Windows 11 Version 25H2 for ARM64-based Systems \u003c10.0.26200.8457",
"product_id": "4"
}
},
{
"category": "product_version",
"name": "10.0.26200.8457",
"product": {
"name": "Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.8457",
"product_id": "20437"
}
}
],
"category": "product_name",
"name": "Windows 11 Version 25H2 for ARM64-based Systems"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26200.8457",
"product": {
"name": "Windows 11 Version 25H2 for x64-based Systems \u003c10.0.26200.8457",
"product_id": "3"
}
},
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
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"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"environmentalsScore": 0.0,
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 6.1,
"userInteraction": "NONE",
"vectorString": "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",
"version": "3.1"
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"category": "impact",
"details": "Elevation of Privilege"
},
{
"category": "exploit_status",
"details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
}
],
"title": "Windows Link-Layer Discovery Protocol (LLDP) Elevation of Privilege Vulnerability"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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