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The denial-of-service (DoS) exploit takes advantage of two features in HTTP/2 that were designed to save Internet bandwith, not power massive amplification attacks.
A threat actor purporting to be from the Libyan Navy's Office of Protocol targeted Brazil's military earlier this year using the rare tactic.
Even after their zero-day vulnerability turned into an n-day, attackers known as Marbled Dust or Sea Turtle continued to spy on military targets that had failed to patch Output Messenger.
In the race over Citrix's latest vulnerability, the bad guys have a huge head start, with broad implications for businesses and critical infrastructure providers worldwide.