vulnerability

noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about vulnerability at Wordnik → Where our words come from →

1. The state of being vulnerable; susceptibility to attack or injury, either physical or emotional; 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.

2. A specific weakness in the protections or defences that (literally or figuratively) surround someone or something.
3. A weakness which allows an attacker to reduce a system's security.