CVE-2021-34420

{"containers": {"cna": {"affected": [{"product": "Zoom Client for Meetings for Windows", "vendor": "Zoom Video Communications Inc", "versions": [{"lessThan": "5.5.4", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "credits": [{"lang": "en", "value": "Laurent Delosieres of ManoMano"}], "datePublic": "2021-11-12T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "The Zoom Client for Meetings for Windows installer before version 5.5.4 does not properly verify the signature of files with .msi, .ps1, and .bat extensions. This could lead to a malicious actor installing malicious software on a customer\u2019s computer."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"description": "Improper Verification of Cryptographic Signature", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-12-02T18:20:33.000Z", "orgId": "99b9af0d-a833-4a5d-9e2f-8b1324f35351", "shortName": "Zoom"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://explore.zoom.us/en/trust/security/security-bulletin"}, {"tags": ["x_refsource_MISC"], "url": "https://medium.com/manomano-tech/a-red-team-operation-leveraging-a-zero-day-vulnerability-in-zoom-80f57fb0822e"}], "source": {"discovery": "USER"}, "title": "Zoom Windows installation executable signature bypass", "x_legacyV4Record": {"CVE_data_meta": {"AKA": "Zoom Communications Inc", "ASSIGNER": "security@zoom.us", "DATE_PUBLIC": "2021-11-12T17:00:00.000Z", "ID": "CVE-2021-34420", "STATE": "PUBLIC", "TITLE": "Zoom Windows installation executable signature bypass"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Zoom Client for Meetings for Windows", "version": {"version_data": [{"version_affected": "<", "version_value": "5.5.4"}]}}]}, "vendor_name": "Zoom Video Communications Inc"}]}}, "credit": [{"lang": "eng", "value": "Laurent Delosieres of ManoMano"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "The Zoom Client for Meetings for Windows installer before version 5.5.4 does not properly verify the signature of files with .msi, .ps1, and .bat extensions. This could lead to a malicious actor installing malicious software on a customer\u2019s computer."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "Improper Verification of Cryptographic Signature"}]}]}, "references": {"reference_data": [{"name": "https://explore.zoom.us/en/trust/security/security-bulletin", "refsource": "MISC", "url": "https://explore.zoom.us/en/trust/security/security-bulletin"}, {"name": "https://medium.com/manomano-tech/a-red-team-operation-leveraging-a-zero-day-vulnerability-in-zoom-80f57fb0822e", "refsource": "MISC", "url": "https://medium.com/manomano-tech/a-red-team-operation-leveraging-a-zero-day-vulnerability-in-zoom-80f57fb0822e"}]}, "source": {"discovery": "USER"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T00:12:50.184Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://explore.zoom.us/en/trust/security/security-bulletin"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://medium.com/manomano-tech/a-red-team-operation-leveraging-a-zero-day-vulnerability-in-zoom-80f57fb0822e"}]}]}, "cveMetadata": {"assignerOrgId": "99b9af0d-a833-4a5d-9e2f-8b1324f35351", "assignerShortName": "Zoom", "cveId": "CVE-2021-34420", "datePublished": "2021-11-11T22:59:18.504Z", "dateReserved": "2021-06-09T00:00:00.000Z", "dateUpdated": "2024-09-16T21:03:43.509Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{}

{"affected": [{"affectedData": [{"product": "Zoom Client for Meetings for Windows", "vendor": "Zoom Video Communications Inc", "versions": [{"lessThan": "5.5.4", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@zoom.us"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:zoom:zoom_client_for_meetings:*:*:*:*:*:windows:*:*", "matchCriteriaId": "CB0A66B6-7584-4017-87B5-D1937E16C7CB", "versionEndExcluding": "5.4.4", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The Zoom Client for Meetings for Windows installer before version 5.5.4 does not properly verify the signature of files with .msi, .ps1, and .bat extensions. This could lead to a malicious actor installing malicious software on a customer\u2019s computer."}, {"lang": "es", "value": "El instalador de Zoom Client for Meetings para Windows anterior a la versi\u00f3n 5.5.4 no verifica correctamente la firma de los archivos con extensiones .msi, .ps1 y .bat. Esto podr\u00eda dar lugar a que un actor malintencionado instalara software malicioso en el ordenador de un cliente"}], "id": "CVE-2021-34420", "lastModified": "2026-06-17T03:55:49.360", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "security@zoom.us", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-11-11T23:15:09.827", "references": [{"source": "security@zoom.us", "tags": ["Vendor Advisory"], "url": "https://explore.zoom.us/en/trust/security/security-bulletin"}, {"source": "security@zoom.us", "tags": ["Third Party Advisory"], "url": "https://medium.com/manomano-tech/a-red-team-operation-leveraging-a-zero-day-vulnerability-in-zoom-80f57fb0822e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://explore.zoom.us/en/trust/security/security-bulletin"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://medium.com/manomano-tech/a-red-team-operation-leveraging-a-zero-day-vulnerability-in-zoom-80f57fb0822e"}], "sourceIdentifier": "security@zoom.us", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

{}