The (1) Conn_StartLogin and (2) cb_Read_Resolver_Result functions in
conn.c in ngIRCd 18 through 20.2, when the configuration option
NoticeAuth is enabled, does not properly handle the return code for
the Handle_Write function, which allows remote attackers to cause a
denial of service (assertion failure and server crash) via unspecified
vectors, related to a "notice auth" message not being sent to a new
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