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9.8
CVSSv3

CVE-2021-39177

Published: 30/08/2021 Updated: 10/09/2021
CVSS v2 Base Score: 7.5 | Impact Score: 6.4 | Exploitability Score: 10
CVSS v3 Base Score: 9.8 | Impact Score: 5.9 | Exploitability Score: 3.9
VMScore: 668
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Summary

Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Versions of Geyser before 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.

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geysermc geyser

References

CWE-287https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaYhttps://nvd.nist.gov
CVSSv3
CVSSv2
CVSSv3
VMScore
Recommendations:
validationCVE-2012-1823malicious code‎CVE-2024-5770CVE-2023-45866CVE-2024-35687local usersCVE-2024-31246CVE-2024-35730
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