According to the CRISC Review Manual (Digital Version), a vulnerability is a flaw or weakness in an asset’s design, implementation, or operation and management that could be exploited by a threat. A delayed removal of employee access is a vulnerability, as it allows former employees to retain access to the organization’s IT assets and processes, which could lead to unauthorized disclosure, modification, or destruction of data or resources. A delayed removal of employee access could be caused by poor personnel management, lack of security awareness, or inadequate access control policies and procedures.

References = CRISC Review Manual (Digital Version), Chapter 1: IT Risk Identification, Section 1.5: IT Risk Identification Methods and Techniques, pp. 32-331