CVE-2021-42305

Microsoft Exchange Server Spoofing Vulnerability

CVSS v3 6.5 MEDIUM
CVSS v2.0 4.3 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

4.3^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:N/C:N/I:P/A:N

Exploitability : 8.6 / Impact : 2.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42305
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42305	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23::::::
	cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21::::::
	cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_22::::::
	cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10::::::
	cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11::::::

History

No history.

Information

Published : 2021-11-10 01:19

Updated : 2026-08-19 17:18

NVD link : CVE-2021-42305

Mitre link : CVE-2021-42305

CVE.ORG link : CVE-2021-42305

JSON object : View

Products Affected

microsoft

exchange_server

CWE

NVD-CWE-noinfo

{"id": "CVE-2021-42305", "cveTags": [], "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 4.3, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "MEDIUM", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": true}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}, {"type": "Secondary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Microsoft Exchange Server 2013 Cumulative Update 23", "versions": [{"status": "affected", "version": "15.00.0", "lessThan": "15.00.1497.026", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Exchange Server 2016 Cumulative Update 21", "versions": [{"status": "affected", "version": "15.01.0", "lessThan": "15.01.2308.020", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Exchange Server 2016 Cumulative Update 22", "versions": [{"status": "affected", "version": "15.0.0", "lessThan": "15.01.2375.017", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Exchange Server 2019 Cumulative Update 10", "versions": [{"status": "affected", "version": "15.02.0", "lessThan": "15.02.0792.019", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Exchange Server 2019 Cumulative Update 11", "versions": [{"status": "affected", "version": "15.02.0", "lessThan": "15.02.0986.014", "versionType": "custom"}], "platforms": ["x64-based Systems"]}]}], "published": "2021-11-10T01:19:49.143", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42305", "source": "secure@microsoft.com"}, {"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42305", "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-noinfo"}]}], "descriptions": [{"lang": "en", "value": "Microsoft Exchange Server Spoofing Vulnerability"}, {"lang": "es", "value": "Una vulnerabilidad de Suplantaci\u00f3n de Identidad de Microsoft Exchange Server. Este ID de CVE es diferente de CVE-2021-41349"}], "lastModified": "2026-08-19T17:18:02.437", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DA166F2A-D83B-4D50-AD0B-668D813E0585"}, {"criteria": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3BE427A4-B0C2-4064-8234-29426325C348"}, {"criteria": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_22:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "449CE85B-E599-44D3-A7C1-5133F6A55E86"}, {"criteria": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B4185347-EEDD-4239-9AB3-410E2EC89D2A"}, {"criteria": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "435343A4-BF10-461A-ABF2-D511A5FBDA75"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}