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Cisco Bug: CSCum51028 - UDP port 5353 (MDNS) is open by default and can't be manually closed

Last Modified

Jun 17, 2019

Products (19)

  • Cisco IOS
  • Cisco Catalyst 6500 Series Virtual Switching Supervisor Engine 720 with 10GE uplinks
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco Catalyst 6500 Series Supervisor Engine 2T
  • Cisco ASR 901-6CZ-FT-A Router
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Known Affected Releases

15.1(2)SY 15.4(1)S

Description (partial)

<B>Symptom:</B>
UDP port 5353 is open by default

<B>Conditions:</B>
UDP port 5353 is associated with MDNS. MDNS was introduced into XE309:

http://www.cisco.com/en/US/docs/ios-xml/ios/wan_waas/configuration/xe-3s/wan-waas-mdns-kwaas.html#GUID-809565E0-978A-464B-9F1B-CEDA7A258C3E

By default this port is open even without any MDNS configurations. There is currently no way to
manually close the port or disable the service if its not needed. The purpose of this bug is to
allow the port to be manually closed or feature manually disabled if MDNS is not needed.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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