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TCP 2483

ProtocolTCP
Port2483
LabelsOracle database listening for insecure client connections to the listener replaces port 1521

Synopsis

  • TCP port 2483 is the IANA-registered port for Oracle TTC (Two-Task Common), the wire protocol used by Oracle Net/TNS.
  • Oracle Database servers (e.g., Oracle 11g/12c/19c/21c) can run the Oracle Net Listener on 2483 for non-SSL connections; clients such as SQL*Plus, Oracle SQL Developer (via JDBC Thin), and Oracle JDBC/ODP.NET connect over this port when configured.
  • Oracle Connection Manager (CMAN) can also listen on or relay TNS traffic over 2483 in front of Oracle Database backends.
  • Some enterprises expose 2483 alongside 2484 (the SSL variant) rather than the more common 1521, and security scanners frequently identify Oracle TNS listeners on 2483 in the wild.
  • Associated exploitation: the Oracle TNS Listener “TNS Poison” vulnerability (CVE-2012-1675) and SID enumeration/brute-force attacks target the listener port, which includes 2483 when used.

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