vulnerability

/ˌvʌlnəɹəˈbɪlɪti/

noun

Susceptibility to attack or injury; the state or condition of being weak or poorly defended.
"The country recognized their defence vulnerability after an airplane landed in front of the central square without any consequences."
A specific weakness in the protections or defences surrounding someone or something.
A weakness which allows an attacker to reduce a system's security

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