Google’s Project Zero has discovered several critical vulnerabilities in Symantec’s (and Norton) products that could allow an attacker to take control of a computer with little effort. Many of the products use the same core engine so all Symantec and Norton branded products are affected by these vulnerabilities. If you are running any Symantec or Norton products you should upgrade as soon as possible. Details of the vulnerabilities have been published so it’s only a matter of time before malware that takes advantage of them is in the wild.
Symantec’s advisory, including a list of affected Symantec and Norton products, is available here: https://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=&suid=20160628_00
Google’s Project Zero write-up is here: http://googleprojectzero.blogspot.com/2016/06/how-to-compromise-enterprise-endpoint.html