CVE-2020-1118

A denial of service vulnerability exists in the Windows implementation of Transport Layer Security (TLS) when it improperly handles certain key exchanges. An attacker who successfully exploited the vulnerability could cause a target system to stop responding. To exploit this vulnerability, a remote unauthenticated attacker could send a specially crafted request to a target system utilizing TLS 1.2 or lower, triggering the system to automatically reboot. The update addresses the vulnerability by changing the way TLS key exchange messages are validated.

CVSS v3 8.6 HIGH
CVSS v2.0 7.8 HIGH

8.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope CHANGED

7.8^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:N/C:N/I:N/A:C

Exploitability : 10.0 / Impact : 6.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact COMPLETE

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1118
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1118	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:microsoft:windows_10:1709:::::::*
	cpe:2.3:o:microsoft:windows_10:1803:::::::*
	cpe:2.3:o:microsoft:windows_10:1809:::::::*
	cpe:2.3:o:microsoft:windows_10:1903:::::::*
	cpe:2.3:o:microsoft:windows_10:1909:::::::*
	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2019:1903:::::::*
	cpe:2.3:o:microsoft:windows_server_2019:1909:::::::*

History

No history.

Information

Published : 2020-05-21 23:15

Updated : 2026-08-19 17:17

NVD link : CVE-2020-1118

Mitre link : CVE-2020-1118

CVE.ORG link : CVE-2020-1118

JSON object : View

Products Affected

microsoft

windows_server_2019
windows_10

CWE

NVD-CWE-Other

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"NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.0, "exploitabilityScore": 3.9}, {"type": "Secondary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Windows 10 Version 1709", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["ARM64-based Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1709 for 32-bit Systems", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["32-bit Systems"]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1803", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["32-bit Systems", "ARM64-based Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1809", "versions": [{"status": "affected", "version": "10.0.17763.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["32-bit Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1809", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["ARM64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1903 for 32-bit Systems", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1903 for ARM64-based Systems", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1903 for x64-based Systems", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1909", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["32-bit Systems", "ARM64-based Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows Server 2019", "versions": [{"status": "affected", "version": "10.0.17763.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows Server 2019 (Server Core installation)", "versions": [{"status": "affected", "version": "10.0.17763.0", "lessThan": "publication", 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"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1118", "tags": ["Patch", "Vendor Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-Other"}]}], "descriptions": [{"lang": "en", "value": "A denial of service vulnerability exists in the Windows implementation of Transport Layer Security (TLS) when it improperly handles certain key exchanges. An attacker who successfully exploited the vulnerability could cause a target system to stop responding.\nTo exploit this vulnerability, a remote unauthenticated attacker could send a specially crafted request to a target system utilizing TLS 1.2 or lower, triggering the system to automatically reboot.\nThe update addresses the vulnerability by changing the way TLS key exchange messages are validated."}, {"lang": "es", "value": "Se presenta una vulnerabilidad denegaci\u00f3n de servicio en la implementaci\u00f3n de Windows de Transport Layer Security (TLS) cuando maneja inapropiadamente determinados intercambios de claves, tambi\u00e9n se conoce como \"Microsoft Windows Transport Layer Security Denial of Service Vulnerability\"."}], "lastModified": "2026-08-19T17:17:20.220", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows_10:1709:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "83B14968-3985-43C3-ACE5-8307196EFAE3"}, {"criteria": "cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7CB85C75-4D35-480E-843D-60579EC75FCB"}, {"criteria": "cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6B8F3DD2-A145-4AF1-8545-CC42892DA3D1"}, {"criteria": "cpe:2.3:o:microsoft:windows_10:1903:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3FB5CDAE-C713-4D9D-9D6A-2C2E8924A4BB"}, {"criteria": "cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E9273B95-20ED-4547-B0A8-95AD15B30372"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DB79EE26-FC32-417D-A49C-A1A63165A968"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2019:1903:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "587088E1-75CC-43A5-A3E3-83D1AA2F10D3"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2019:1909:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9C5D9764-AD4B-4F86-BDAB-188896D9D02B"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}