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Cisco Bug: CSCvi60900 - DHCP Leasequery Padding contains previously used data

Last Modified

Jun 06, 2018

Products (32)

  • Cisco IOS
  • Cisco ASR 920-24TZ-M Router
  • Cisco ASR 920-10SZ-PD Router
  • Cisco NCS 4202
  • Cisco 4221 Integrated Services Router
  • Cisco 4431 Integrated Services Router
  • Cisco NCS 4216
  • Cisco 4321 Integrated Services Router
  • Cisco 4331 Integrated Services Router
  • Cisco ASR 1002-X Router
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Known Affected Releases


Description (partial)

DHCP Leasequery packet Option Padding is not zeros.

Cisco UBR8 configured with:
    cable source-verify dhcp
And either:
    'ip dhcp relay information option' configured in global configuration or 'ip dhcp relay information option-insert' configured on the interface.
The data leaked is in the Leasequery packet which is sent from the dhcp relay to the dhcp server.  The data leaked could be data contents in the 
previous DHCP packets relayed from CMTS to the DHCP server.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
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