CVE-2021-39177

{"containers": {"cna": {"affected": [{"product": "Geyser", "vendor": "GeyserMC", "versions": [{"status": "affected", "version": "<= 1.4.1-SNAPSHOT"}]}], "descriptions": [{"lang": "en", "value": "Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Versions of Geyser prior to 1.4.2-SNAPSHOT allow anyone that can connect to the server to forge a LoginPacket with manipulated JWT token allowing impersonation as any user. Version 1.4.2-SNAPSHOT contains a patch for the issue. There are no known workarounds aside from upgrading."}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-287", "description": "CWE-287: Improper Authentication", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-08-30T23:00:12.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6"}, {"tags": ["x_refsource_MISC"], "url": "https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY"}], "source": {"advisory": "GHSA-h77f-xxx7-4858", "discovery": "UNKNOWN"}, "title": "User impersonation due to incorrect handling of the login JWT", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-39177", "STATE": "PUBLIC", "TITLE": "User impersonation due to incorrect handling of the login JWT"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Geyser", "version": {"version_data": [{"version_value": "<= 1.4.1-SNAPSHOT"}]}}]}, "vendor_name": "GeyserMC"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Versions of Geyser prior to 1.4.2-SNAPSHOT allow anyone that can connect to the server to forge a LoginPacket with manipulated JWT token allowing impersonation as any user. Version 1.4.2-SNAPSHOT contains a patch for the issue. There are no known workarounds aside from upgrading."}]}, "impact": {"cvss": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-287: Improper Authentication"}]}]}, "references": {"reference_data": [{"name": "https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858", "refsource": "CONFIRM", "url": "https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858"}, {"name": "https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6", "refsource": "MISC", "url": "https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6"}, {"name": "https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY", "refsource": "MISC", "url": "https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY"}]}, "source": {"advisory": "GHSA-h77f-xxx7-4858", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T01:58:18.223Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-39177", "datePublished": "2021-08-30T23:00:12.000Z", "dateReserved": "2021-08-16T00:00:00.000Z", "dateUpdated": "2024-08-04T01:58:18.223Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "Geyser", "vendor": "GeyserMC", "versions": [{"status": "affected", "version": "<= 1.4.1-SNAPSHOT"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:geysermc:geyser:*:*:*:*:*:*:*:*", "matchCriteriaId": "515038BF-D294-47CE-B315-48E1C3CA2C13", "versionEndExcluding": "1.4.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Versions of Geyser prior to 1.4.2-SNAPSHOT allow anyone that can connect to the server to forge a LoginPacket with manipulated JWT token allowing impersonation as any user. Version 1.4.2-SNAPSHOT contains a patch for the issue. There are no known workarounds aside from upgrading."}, {"lang": "es", "value": "Geyser es un puente entre Minecraft: Bedrock Edition y Minecraft: Java Edition. Unas versiones de Geyser anteriores a 1.4.2-SNAPSHOT permiten a cualquiera que pueda conectarse al servidor falsificar un LoginPacket con un token JWT manipulado, permitiendo una suplantaci\u00f3n de identidad como cualquier usuario. La versi\u00f3n 1.4.2-SNAPSHOT contiene un parche para este problema. No se presentan soluciones conocidas aparte de la actualizaci\u00f3n"}], "id": "CVE-2021-39177", "lastModified": "2026-06-17T04:03:15.263", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 7.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-08-30T23:15:07.070", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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