Recorded Future says Chinese intelligence agencies are doctoring the Chinese National Vulnerabilities Database (CNNVD) to hide security flaws that government hackers might have an interest in. The US company says it noticed in recent months mass edits to the CNNVD website. The backdating operations started after a previous Recorded Future report in November last year in which Recorded Future described how CNNVD delays the disclosure of critical bugs to give Chinese cyber intelligence agencies the time to evaluate the operational utility of said vulnerabilities. This was done to aid surveillance of Chinese internal entities.
Source: https://www.bleepingcomputer.com/news/security/chinese-intelligence-agencies-are-doctoring-the-countrys-vulnerability-database/