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Urbancode Deploy (UCD): The HTTP/2 implementation in Apache Tomcat 9.0.0.M1 to 9.0.14 and 8.5.0 to 8.5.37 accepted streams with excessive numbers of SETTINGS frames and also permitted clients to keep streams open without reading/writing request/response data. By keeping streams open for requests that utilised the Servlet API’s blocking I/O, clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.

Affected product(s) and affected version(s):

Affected Product(s) Version(s)
UCD – IBM UrbanCode Deploy All

Refer to the following reference URLs for remediation and additional vulnerability details:  
Source Bulletin: https://www.ibm.com/support/pages/node/2326953





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