The National Security Agency penetrated Huawei's corporate network to tap the communications of its executives, gain insights into the workings of its routers/switches and to develop backdoors enabling it to penetrate the networks of its customers, according to reports published over the weekend by The New York Times and Der Spiegel. The articles cite NSA documents from 2010 disclosed by Edward Snowden on operation "Shotgiant."
http://www.nytimes.com/2014/03/23/world/asia/nsa-breached-chinese-servers-seen-as-spy-peril.html
http://www.spiegel.de/international/
http://www.nytimes.com/2014/03/23/world/asia/nsa-breached-chinese-servers-seen-as-spy-peril.html
http://www.spiegel.de/international/