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Cisco Bug: CSCtd54234 - Chunked encoding in HTTP POST method not handled properly

Last Modified

Nov 09, 2016

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases


Description (partial)


Two issues with this case -    
1. CSC does not support chunked encoding when used with POST message   
2. iwss-process runs into an infinite loop when a POST with chunked message is used. 


Procedure to reproduce the problem    
    1. From netcat paste the following from a client machine-
% nc 80 POST /t3cometserver.asp HTTP/1.1 Host: Transfer-Encoding: chunked Content-Type: text/xml Expect: 100-continue

CSC HTTP proxy process can go into a loop pegging CPU usage to 100%.
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