The developer of a porn-filtering software has been ordered to rush software patches to address security problems which have cropped up.

"The Ministry of Industry and Information Technology told us to make the software safer as soon a series of security vulnerabilities were found," Zhang Chenmin, general manager of the Zhengzhou-based Jinhui Computer System Engineering Co, told China Daily yesterday.

The firm developed the Green Dam-Youth Escort porn-filtering software, which will have to be installed on all computers sold in the country from July 1. The software has been downloaded 7.17 million times from the company's website up to last month, and 2.62 million computers in schools across the country have installed it.