CVE-2021-39177
High
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.
SeverityHigh
CVSS7.4
Exploit probability—
ProductGeyser
PublishedAug 30, 2021
First seenAug 30, 2021
Weakness typeCWE-287Improper authentication
How to fix
Update
- geysermc geyser1.4.2 or later
- org.geysermc:connector1.4.2-SNAPSHOT or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| geysermc geyser | v < 1.4.2 | 1.4.2 |
| org.geysermc:connectorMaven | v < 1.4.2-SNAPSHOT | 1.4.2-SNAPSHOT |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.