Neither proprietary nor open source has proven to be more secure than the other. Until we can write the perfect code for the perfect hardware, there will always be vulnerabilities. Since perfection is unachievable, so is perfect security. The best we can do is be vigilant in our monitoring, patch whenever possible, and plan for the worst. If you are prepaired for the inevitable, when it happens you won't be caught with your pants down and screaming "why me?".
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