MSRC_CVE-2025-21218
Vulnerability from csaf_microsoft - Published: 2025-01-14 00:00 - Updated: 2025-01-16 00:00Summary
Windows Kerberos Denial of Service 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-400
- Uncontrolled Resource Consumption
Affected products
Fixed
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows Server 2012 6.2.9200.25273
Windows Server 2012
|
6.2.9200.25273 | ||
|
Windows Server 2012 (Server Core installation) 6.2.9200.25273
Windows Server 2012 (Server Core installation)
|
6.2.9200.25273 | ||
|
Windows Server 2012 R2 6.3.9600.22371
Windows Server 2012 R2
|
6.3.9600.22371 | ||
|
Windows Server 2012 R2 (Server Core installation) 6.3.9600.22371
Windows Server 2012 R2 (Server Core installation)
|
6.3.9600.22371 | ||
|
Windows Server 2016 10.0.14393.7699
Windows Server 2016
|
10.0.14393.7699 | ||
|
Windows Server 2016 (Server Core installation) 10.0.14393.7699
Windows Server 2016 (Server Core installation)
|
10.0.14393.7699 | ||
|
Windows Server 2019 10.0.17763.6775
Windows Server 2019
|
10.0.17763.6775 | ||
|
Windows Server 2019 (Server Core installation) 10.0.17763.6775
Windows Server 2019 (Server Core installation)
|
10.0.17763.6775 | ||
|
Windows Server 2022 10.0.20348.3091
Windows Server 2022
|
10.0.20348.3091 | ||
|
Windows Server 2022 (Server Core installation) 10.0.20348.3091
Windows Server 2022 (Server Core installation)
|
10.0.20348.3091 | ||
|
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1369
Windows Server 2022, 23H2 Edition (Server Core installation)
|
10.0.25398.1369 | ||
|
Windows Server 2025 10.0.26100.2894
Windows Server 2025
|
10.0.26100.2894 | ||
|
Windows Server 2025 (Server Core installation) 10.0.26100.2894
Windows Server 2025 (Server Core installation)
|
10.0.26100.2894 |
Known affected
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows Server 2025 (Server Core installation) <10.0.26100.2894
Windows Server 2025 (Server Core installation)
|
<10.0.26100.2894 |
Vendor Fix
fix
|
|
|
Windows Server 2025 <10.0.26100.2894
Windows Server 2025
|
<10.0.26100.2894 |
Vendor Fix
fix
|
|
|
Windows Server 2022, 23H2 Edition (Server Core installation) <10.0.25398.1369
Windows Server 2022, 23H2 Edition (Server Core installation)
|
<10.0.25398.1369 |
Vendor Fix
fix
|
|
|
Windows Server 2022 (Server Core installation) <10.0.20348.3091
Windows Server 2022 (Server Core installation)
|
<10.0.20348.3091 |
Vendor Fix
fix
|
|
|
Windows Server 2022 <10.0.20348.3091
Windows Server 2022
|
<10.0.20348.3091 |
Vendor Fix
fix
|
|
|
Windows Server 2019 (Server Core installation) <10.0.17763.6775
Windows Server 2019 (Server Core installation)
|
<10.0.17763.6775 |
Vendor Fix
fix
|
|
|
Windows Server 2019 <10.0.17763.6775
Windows Server 2019
|
<10.0.17763.6775 |
Vendor Fix
fix
|
|
|
Windows Server 2016 (Server Core installation) <10.0.14393.7699
Windows Server 2016 (Server Core installation)
|
<10.0.14393.7699 |
Vendor Fix
fix
|
|
|
Windows Server 2016 <10.0.14393.7699
Windows Server 2016
|
<10.0.14393.7699 |
Vendor Fix
fix
|
|
|
Windows Server 2012 R2 (Server Core installation) <6.3.9600.22371
Windows Server 2012 R2 (Server Core installation)
|
<6.3.9600.22371 |
Vendor Fix
fix
|
|
|
Windows Server 2012 R2 <6.3.9600.22371
Windows Server 2012 R2
|
<6.3.9600.22371 |
Vendor Fix
fix
|
|
|
Windows Server 2012 (Server Core installation) <6.2.9200.25273
Windows Server 2012 (Server Core installation)
|
<6.2.9200.25273 |
Vendor Fix
fix
|
|
|
Windows Server 2012 <6.2.9200.25273
Windows Server 2012
|
<6.2.9200.25273 |
Vendor Fix
fix
|
Threats
Impact
Denial of Service
Exploit Status
Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
References
7 references
Acknowledgments
<a href="https://twitter.com/keyz3r0">k0shl</a> with <a href="https://www.cyberkl.com/">Kunlun Lab</a>
{
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"acknowledgments": [
{
"names": [
"\u003ca href=\"https://twitter.com/keyz3r0\"\u003ek0shl\u003c/a\u003e with \u003ca href=\"https://www.cyberkl.com/\"\u003eKunlun Lab\u003c/a\u003e"
]
}
],
"aggregate_severity": {
"namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
"text": "Important"
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"distribution": {
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"tlp": {
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"notes": [
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"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"
},
{
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"text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
"title": "Customer Action"
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"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"references": [
{
"category": "self",
"summary": "CVE-2025-21218 Windows Kerberos Denial of Service Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21218"
},
{
"category": "self",
"summary": "CVE-2025-21218 Windows Kerberos Denial of Service Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2025/msrc_cve-2025-21218.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 Kerberos Denial of Service Vulnerability",
"tracking": {
"current_release_date": "2025-01-16T00:00:00.000Z",
"generator": {
"date": "2026-04-02T00:47:54.503Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2025-21218",
"initial_release_date": "2025-01-14T00:00:00.000Z",
"revision_history": [
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"date": "2025-01-14T00:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
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{
"date": "2025-01-16T00:00:00.000Z",
"legacy_version": "1.1",
"number": "2",
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"status": "final",
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"category": "product_version",
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"vulnerabilities": [
{
"cve": "CVE-2025-21218",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"notes": [
{
"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
},
{
"category": "faq",
"text": "An unauthenticated attacker could use a specially crafted application to leverage a protocol vulnerability in the Kerberos Key Distribution Center (KDC) Proxy Service to perform denial of service against the target.",
"title": "How could an attacker exploit this vulnerability?"
}
],
"product_status": {
"fixed": [
"10378",
"10379",
"10483",
"10543",
"10816",
"10855",
"11571",
"11572",
"11923",
"11924",
"12244",
"12436",
"12437"
],
"known_affected": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12",
"13"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2025-21218 Windows Kerberos Denial of Service Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21218"
},
{
"category": "self",
"summary": "CVE-2025-21218 Windows Kerberos Denial of Service Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2025/msrc_cve-2025-21218.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2025-01-14T00:00:00.000Z",
"details": "10.0.17763.6775:Security Update:https://support.microsoft.com/help/5050008",
"product_ids": [
"7",
"6"
],
"url": "https://support.microsoft.com/help/5050008"
},
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"4"
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{
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"2"
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},
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"date": "2025-01-14T00:00:00.000Z",
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"product_ids": [
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],
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},
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"date": "2025-01-14T00:00:00.000Z",
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{
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"date": "2025-01-14T00:00:00.000Z",
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"product_ids": [
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"12"
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"url": "https://support.microsoft.com/help/5050004"
},
{
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"product_ids": [
"11",
"10"
],
"url": "https://support.microsoft.com/help/5050048"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"environmentalsScore": 0.0,
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 6.5,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C",
"version": "3.1"
},
"products": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12",
"13"
]
}
],
"threats": [
{
"category": "impact",
"details": "Denial of Service"
},
{
"category": "exploit_status",
"details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
}
],
"title": "Windows Kerberos Denial of Service 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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