Critical. A vulnerability whose exploitation could allow code execution without user interaction. These scenarios include self-propagating malware (e.g. network worms), or unavoidable common use scenarios where code execution occurs without warnings or prompts. This could mean browsing to a web page or opening email.
A strain is a stretching or tearing of muscle or tendon. A tendon is a fibrous cord of tissue that connects muscles to bones. Strains often occur in the lower back and in the hamstring muscle in the back of your thigh. Initial treatment for both sprains and strains includes rest, ice, compression and elevation.
Definition of strain for Students. 1  1 : great worry and concern or physical effort Perhaps, the pressures of everyday stress and strain had gotten her down. 2  2 : something that causes great worry and concern or physical effort Running the business was a strain on him. The heavy load was a strain on her back.