The phrase "a complex threat" is correct and usable in written English.
You can use it when discussing a situation or issue that involves multiple factors or elements that pose a danger or risk.
Example: "The cybersecurity team is currently assessing a complex threat that involves various attack vectors and vulnerabilities."
Alternatives: "a multifaceted danger" or "a complicated risk".
The reason I am providing these details is that they illustrate the amount of time and effort devoted to counter-terrorism in government, and they show how many organisations need to be involved to deal with such a complex threat.
Silicon Valley executives and entrepreneurs, academics and former high-level government officials painted a picture of a complex threat landscape, where foreign nation states routinely hack into U.S. companies and government agencies with near impunity, and everything from utilities and critical infrastructure, to cell phones and cars could be vulnerable to cyber attack.
By being prepared and validating all aspects of your program, you, too, can crush vulnerabilities and thrive in a complex threat environment.
It is a complex threat, but we already have many of the tools we need to address climate fragility and limit risks to peace.
"This is a highly complicated investigation of a very complex threat.
The report paints a picture of an increasingly complex threat, with crime groups diversifying into areas like carbon credit and payment card fraud while conducting more traditional activities like drug and human trafficking with growing sophistication.
A new group with military training is already posing a more complex threat.
"It's a more complex threat to detect and stop" than simple viruses and worms, said Vincent Weafer, the head of Symantec Security Response, a unit of the Symantec Corporation.
Product counterfeiting is a very complex threat that requires perspective from many disciplines for prevention.
A more complex threat landscape means increased use of multifactor authentication, using both biometrics and passwords or PINs.
The report described an increasingly complex threat, with crime groups getting involved in matters like carbon credit and payment card fraud, while conducting more traditional activities like drug and human trafficking with growing sophistication.
