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I. Basic Information for CVE-2021-39177
Vulnerability Information

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Vulnerability Title
User impersonation due to incorrect handling of the login JWT
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Github Geyser授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Github Geyser是Geyser 是 Minecraft: Bedrock Edition 和 Minecraft: Java Edition 之间的桥梁,缩小了那些想要真正跨平台玩的人之间的差距。 Geyser 1.4.2-SNAPSHOT之前版本存在授权问题漏洞,该漏洞源于Geyser 是 Minecraft: Bedrock Edition 和 Minecraft: Java Edition 之间的桥梁。 Geyser 1.4.2-SNAPSHOT 之前的版本允许任何可以连接到服务器的人伪造
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
GeyserMCGeyser <= 1.4.1-SNAPSHOT -
II. Public POCs for CVE-2021-39177
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III. Intelligence Information for CVE-2021-39177
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IV. Related Vulnerabilities
V. Comments for CVE-2021-39177

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