An image-based exploit could allow hackers to access and execute code on the servers used to support corporate users of BlackBerry smartphones. The flaw that been rated as high severity and actual vulnerability in BlackBerry Enterprise Servers resulted from how the server processes image files. Blackberry recommends that affected customers update to the latest available software version to be fully protected from these vulnerabilities. The exploit uses a TIFF image containing malicious code, and the dangerous image can either be linked to an email or attached directly to it.
Source: https://thehackernews.com/2013/02/blackberry-enterprise-servers.html