According to Joost Jager (the independent Bitcoin lightening programmer), he claims that If script kids would be interested, they could take down those shiny new 5 BTC Wumbo channels with negligible cost and no effort at all.
Joost Jager stated that a channel would not work with more than 483 HLTCs at a go, no matter the channel capacity. Wumbo channels allow their customers to carry out larger transactions, and, understandably, every channel is looking forward to becoming the world's payment system. But with an exploitable vulnerability like this, people should think about its security.
Nonetheless, many people think such attacks have happened at a large scale, and by that, they meant blocking all large channels. Some also doubt if this grieving attack is the biggest or one of the most significant unsolved attack vectors on lightning today.
He responded that there's no claim that there aren't other more prominent unsolved attack vectors on lightning that'll cause loss of money. We can say this is the biggest with the underlying fact that we can't solve it. Joost Jager also stated that he's currently developing a project called the circuit breaker. The project's primary goal is to encourage thinking about the problem with the potential to grow into a full-fledged Lightning protection system.
Source: Cointelegraph
