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In Nacos before version 1.4.1, when configured to use authentication (-Dnacos.core.auth.enabled=true) Nacos uses the AuthFilter servlet filter to enforce authentication. This filter has a backdoor that enables Nacos servers to bypass this filter and therefore skip authentication checks. This mechanism relies on the user-agent HTTP header so it can be easily spoofed. This issue may allow any user to carry out any administrative tasks on the Nacos server.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"29441","Ordinal":"2","NoteData":"2021-04-27","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"29441","Ordinal":"3","NoteData":"2021-04-27","Type":"Other","Title":"Modified"}]}}}