This is speculative. But people have been wondering how Hamas could have breached the border in 15 places with no response for hours, and we have no definite answers yet.
One of the theories is a widespread cyber attack by Iran took down the defenses and alerting systems. Some people (e.g. Bret Weinstein) don't think that is plausable. I think it is highly plausable.
I worked in Computer Security from 1993 until 2003, and paid close attention afterwards. I categorized vulnerabilities for the purpose of figuring out how we could fix code and prevent attacks, and for testing intrusion detection systems. As the Internet exploded, the attack surfaces exploded. Languages exploded. People wrote shell script CGI scripts (super easy to attack those). The vulnerability density was just going up, and rapidly. Every time I've looked back at the situation I've been agahst at how much worse it has become. Almost every single computer on the Internet is vulnerable to about two to three dozen zero-day attacks at any given time.
Technology moves quickly to deviver the "works if you use it properly" product (which everybody notices and cares about) but never devivers the "always fails safely when used improperly" property which is necessary for security, because nobody evaluates that or can see that.
So did Iran take down their intrustion detection systems, their reporting systems, alerting systems, defenses, etc, in a cyber attack? I don't know. But they have the capability to. Every major nation has the capability do to this to any other nation.
