MSRC_CVE-2026-42987
Vulnerability from csaf_microsoft - Published: 2026-06-09 07:00 - Updated: 2026-06-09 07:00Summary
Windows Deployment Services (WDS) Remote Code Execution
Severity
Critical
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-416
- Use After Free
Affected products
Fixed
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows Server 2012 6.2.9200.26132
Windows Server 2012
|
6.2.9200.26132 | ||
|
Windows Server 2012 (Server Core installation) 6.2.9200.26132
Windows Server 2012 (Server Core installation)
|
6.2.9200.26132 | ||
|
Windows Server 2012 R2 6.3.9600.23228
Windows Server 2012 R2
|
6.3.9600.23228 | ||
|
Windows Server 2012 R2 (Server Core installation) 6.3.9600.23228
Windows Server 2012 R2 (Server Core installation)
|
6.3.9600.23228 | ||
|
Windows Server 2016 10.0.14393.9234
Windows Server 2016
|
10.0.14393.9234 | ||
|
Windows Server 2016 (Server Core installation) 10.0.14393.9234
Windows Server 2016 (Server Core installation)
|
10.0.14393.9234 | ||
|
Windows Server 2019 10.0.17763.8880
Windows Server 2019
|
10.0.17763.8880 | ||
|
Windows Server 2019 (Server Core installation) 10.0.17763.8880
Windows Server 2019 (Server Core installation)
|
10.0.17763.8880 | ||
|
Windows Server 2022 10.0.20348.5256
Windows Server 2022
|
10.0.20348.5256 | ||
|
Windows Server 2022 (Server Core installation) 10.0.20348.5256
Windows Server 2022 (Server Core installation)
|
10.0.20348.5256 | ||
|
Windows Server 2025 10.0.26100.32995
Windows Server 2025
|
10.0.26100.32995 | ||
|
Windows Server 2025 (Server Core installation) 10.0.26100.32995
Windows Server 2025 (Server Core installation)
|
10.0.26100.32995 |
Known affected
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows Server 2025 (Server Core installation) <10.0.26100.32995
Windows Server 2025 (Server Core installation)
|
<10.0.26100.32995 |
Vendor Fix
fix
|
|
|
Windows Server 2025 <10.0.26100.32995
Windows Server 2025
|
<10.0.26100.32995 |
Vendor Fix
fix
|
|
|
Windows Server 2022 (Server Core installation) <10.0.20348.5256
Windows Server 2022 (Server Core installation)
|
<10.0.20348.5256 |
Vendor Fix
fix
|
|
|
Windows Server 2022 <10.0.20348.5256
Windows Server 2022
|
<10.0.20348.5256 |
Vendor Fix
fix
|
|
|
Windows Server 2019 (Server Core installation) <10.0.17763.8880
Windows Server 2019 (Server Core installation)
|
<10.0.17763.8880 |
Vendor Fix
fix
|
|
|
Windows Server 2019 <10.0.17763.8880
Windows Server 2019
|
<10.0.17763.8880 |
Vendor Fix
fix
|
|
|
Windows Server 2016 (Server Core installation) <10.0.14393.9234
Windows Server 2016 (Server Core installation)
|
<10.0.14393.9234 |
Vendor Fix
fix
|
|
|
Windows Server 2016 <10.0.14393.9234
Windows Server 2016
|
<10.0.14393.9234 |
Vendor Fix
fix
|
|
|
Windows Server 2012 R2 (Server Core installation) <6.3.9600.23228
Windows Server 2012 R2 (Server Core installation)
|
<6.3.9600.23228 |
Vendor Fix
fix
|
|
|
Windows Server 2012 R2 <6.3.9600.23228
Windows Server 2012 R2
|
<6.3.9600.23228 |
Vendor Fix
fix
|
|
|
Windows Server 2012 (Server Core installation) <6.2.9200.26132
Windows Server 2012 (Server Core installation)
|
<6.2.9200.26132 |
Vendor Fix
fix
|
|
|
Windows Server 2012 <6.2.9200.26132
Windows Server 2012
|
<6.2.9200.26132 |
Vendor Fix
fix
|
Threats
Impact
Remote Code Execution
Exploit Status
Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
References
7 references
Acknowledgments
R4nger with Kunlun Lab & Zhiniang Peng with HUST
{
"document": {
"acknowledgments": [
{
"names": [
"R4nger with Kunlun Lab \u0026amp; Zhiniang Peng with HUST"
]
}
],
"aggregate_severity": {
"namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
"text": "Critical"
},
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Public",
"tlp": {
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"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-2026-42987 Windows Deployment Services (WDS) Remote Code Execution - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42987"
},
{
"category": "self",
"summary": "CVE-2026-42987 Windows Deployment Services (WDS) Remote Code Execution - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-42987.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 Deployment Services (WDS) Remote Code Execution",
"tracking": {
"current_release_date": "2026-06-09T07:00:00.000Z",
"generator": {
"date": "2026-06-09T17:48:03.968Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2026-42987",
"initial_release_date": "2026-06-09T07:00:00.000Z",
"revision_history": [
{
"date": "2026-06-09T07:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.17763.8880",
"product": {
"name": "Windows Server 2019 \u003c10.0.17763.8880",
"product_id": "6"
}
},
{
"category": "product_version",
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"product": {
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"product_id": "11571"
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}
],
"category": "product_name",
"name": "Windows Server 2019"
},
{
"branches": [
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"product": {
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"product_id": "5"
}
},
{
"category": "product_version",
"name": "10.0.17763.8880",
"product": {
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"product_id": "11572"
}
}
],
"category": "product_name",
"name": "Windows Server 2019 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.20348.5256",
"product": {
"name": "Windows Server 2022 \u003c10.0.20348.5256",
"product_id": "4"
}
},
{
"category": "product_version",
"name": "10.0.20348.5256",
"product": {
"name": "Windows Server 2022 10.0.20348.5256",
"product_id": "11923"
}
}
],
"category": "product_name",
"name": "Windows Server 2022"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.20348.5256",
"product": {
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"product_id": "3"
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},
{
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"name": "10.0.20348.5256",
"product": {
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"product_id": "11924"
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],
"category": "product_name",
"name": "Windows Server 2022 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26100.32995",
"product": {
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"product_id": "1"
}
},
{
"category": "product_version",
"name": "10.0.26100.32995",
"product": {
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"product_id": "12437"
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}
],
"category": "product_name",
"name": "Windows Server 2025 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26100.32995",
"product": {
"name": "Windows Server 2025 \u003c10.0.26100.32995",
"product_id": "2"
}
},
{
"category": "product_version",
"name": "10.0.26100.32995",
"product": {
"name": "Windows Server 2025 10.0.26100.32995",
"product_id": "12436"
}
}
],
"category": "product_name",
"name": "Windows Server 2025"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.14393.9234",
"product": {
"name": "Windows Server 2016 \u003c10.0.14393.9234",
"product_id": "8"
}
},
{
"category": "product_version",
"name": "10.0.14393.9234",
"product": {
"name": "Windows Server 2016 10.0.14393.9234",
"product_id": "10816"
}
}
],
"category": "product_name",
"name": "Windows Server 2016"
},
{
"branches": [
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"product_id": "7"
}
},
{
"category": "product_version",
"name": "10.0.14393.9234",
"product": {
"name": "Windows Server 2016 (Server Core installation) 10.0.14393.9234",
"product_id": "10855"
}
}
],
"category": "product_name",
"name": "Windows Server 2016 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c6.2.9200.26132",
"product": {
"name": "Windows Server 2012 \u003c6.2.9200.26132",
"product_id": "12"
}
},
{
"category": "product_version",
"name": "6.2.9200.26132",
"product": {
"name": "Windows Server 2012 6.2.9200.26132",
"product_id": "10378"
}
}
],
"category": "product_name",
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},
{
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"product_id": "11"
}
},
{
"category": "product_version",
"name": "6.2.9200.26132",
"product": {
"name": "Windows Server 2012 (Server Core installation) 6.2.9200.26132",
"product_id": "10379"
}
}
],
"category": "product_name",
"name": "Windows Server 2012 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c6.3.9600.23228",
"product": {
"name": "Windows Server 2012 R2 \u003c6.3.9600.23228",
"product_id": "10"
}
},
{
"category": "product_version",
"name": "6.3.9600.23228",
"product": {
"name": "Windows Server 2012 R2 6.3.9600.23228",
"product_id": "10483"
}
}
],
"category": "product_name",
"name": "Windows Server 2012 R2"
},
{
"branches": [
{
"category": "product_version_range",
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"product": {
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"product_id": "9"
}
},
{
"category": "product_version",
"name": "6.3.9600.23228",
"product": {
"name": "Windows Server 2012 R2 (Server Core installation) 6.3.9600.23228",
"product_id": "10543"
}
}
],
"category": "product_name",
"name": "Windows Server 2012 R2 (Server Core installation)"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-42987",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"notes": [
{
"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
},
{
"category": "faq",
"text": "Successful exploitation of this vulnerability requires an attacker to win a race condition.",
"title": "According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?"
},
{
"category": "faq",
"text": "An attacker could send specially crafted network requests to a Windows Server system that has the Windows Deployment Services (WDS) role enabled and is listening for TFTP traffic. By triggering an error in how the server handles simultaneous requests, an unauthenticated remote attacker could cause the service to use invalid memory, which could allow the attacker to run code on the affected server.",
"title": "How could an attacker exploit this vulnerability?"
}
],
"product_status": {
"fixed": [
"10378",
"10379",
"10483",
"10543",
"10816",
"10855",
"11571",
"11572",
"11923",
"11924",
"12436",
"12437"
],
"known_affected": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2026-42987 Windows Deployment Services (WDS) Remote Code Execution - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42987"
},
{
"category": "self",
"summary": "CVE-2026-42987 Windows Deployment Services (WDS) Remote Code Execution - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-42987.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "10.0.17763.8880:Security Update:https://support.microsoft.com/help/5094123",
"product_ids": [
"6",
"5"
],
"url": "https://support.microsoft.com/help/5094123"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "10.0.20348.5256:Security Update:https://support.microsoft.com/help/5094128",
"product_ids": [
"4",
"3"
],
"url": "https://support.microsoft.com/help/5094128"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "10.0.26100.32995:Security Update:https://support.microsoft.com/help/5094125",
"product_ids": [
"1",
"2"
],
"url": "https://support.microsoft.com/help/5094125"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "10.0.14393.9234:Security Update:https://support.microsoft.com/help/5094122",
"product_ids": [
"8",
"7"
],
"url": "https://support.microsoft.com/help/5094122"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "6.2.9200.26132:Monthly Rollup:https://support.microsoft.com/help/5094042",
"product_ids": [
"12",
"11"
],
"url": "https://support.microsoft.com/help/5094042"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "6.3.9600.23228:Monthly Rollup:https://support.microsoft.com/help/5094041",
"product_ids": [
"10",
"9"
],
"url": "https://support.microsoft.com/help/5094041"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"environmentalsScore": 0.0,
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 7.1,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
"version": "3.1"
},
"products": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12"
]
}
],
"threats": [
{
"category": "impact",
"details": "Remote Code Execution"
},
{
"category": "exploit_status",
"details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
}
],
"title": "Windows Deployment Services (WDS) Remote Code Execution"
}
]
}
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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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