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Cisco Bug: CSCtb66925 - Router crash during port scan

Last Modified

Feb 13, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

12.4(21.14)T1 12.4(24)T1 12.4(24.6)PI11v 12.4(24.6.7)PIL12 15.0(1)M

Description (partial)

Symptoms: A router may crash during a port scan to TCP port 53.

Conditions: DNS functionality must be configured on the device.

This crash has been observed only in 12.4(24)T, 12.4(24)T1, and 12.4(22)T. It 
is a timing condition on processing DNS TCP traffic.
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