This is the best summary I could come up with:

In a memo sent to regional MLS providers and reported by Cincinnati TV station WCPO, Rapattoni representatives wrote:

As we have previously communicated, Rapattoni’s production network was hit by a cyberattack and we are working diligently around the clock to get systems restored as soon as possible.

While Rapattoni has referred to the incident as a cyberattack, it has been widely reported that the event is a ransomware attack, in which criminals gain unauthorized access to a victim’s network, encrypt or download crucial data and demand payment in exchange for decrypting the data or promising not to publish it.

The outage is a potent reminder of the real-world disruptions that cyberattacks can impose on large numbers of people or businesses that depend on a service that gets hacked.

The president and CEO of BAREIS, a broker-owned multiple listing service serving realty professionals in Northern California, said that the MLS data it provides hasn’t been updated since August 8.

The damage the outage is causing to agents, buyers, renters, and sellers could get worse unless services are restored in the next few days.

I’m a bot and I’m open source!

Let’s all raise our glasses to the MLS sysadmins who are having a terrible, horrible, no good, very bad week.

I worked in real estate tech for over 15 years. Rappatoni powers a lot of MLSs. That’s a lot of markets that couldn’t see new inventory as people are trying to to scramble onto the market before labor day (the traditional end to the US sales season).