In uncountable|lang=en terms the difference between vulnerability and vulnerability

is that vulnerability is (uncountable) susceptibility to attack or injury; the state or condition of being weak or poorly defended while vulnerability is (uncountable) susceptibility to attack or injury; the state or condition of being weak or poorly defended.

In countable|lang=en terms the difference between vulnerability and vulnerability

is that vulnerability is (countable) a specific weakness in the protections or defences surrounding someone or something while vulnerability is (countable) a specific weakness in the protections or defences surrounding someone or something.

In computing|lang=en terms the difference between vulnerability and vulnerability

is that vulnerability is (computing) a weakness which allows an attacker to reduce a system's security while vulnerability is (computing) a weakness which allows an attacker to reduce a system's security.

As nouns the difference between vulnerability and vulnerability

is that vulnerability is (uncountable) susceptibility to attack or injury; the state or condition of being weak or poorly defended while vulnerability is (uncountable) susceptibility to attack or injury; the state or condition of being weak or poorly defended.