DDoS attacks unfortunately have become a rather common occurrence, and another one has cropped up that is affecting Ubisoft servers and latency.
"We’re currently monitoring a DDoS attack, which may impact latency or connections to our games," Ubisoft said in a tweet from it's official support account. It's official forums added that the attack is "impacting a number of our online services for Rainbow Six Siege, For Honor, Steep, Ghost Recon Wildlands, Uplay PC, and other online titles." It said it was working quickly to resolve the issue and minimize players problems.
Earlier this month, Ubisoft also reported similar server issues, although it was never confirmed if the "degradation" was because of a DDoS attack.