The net mission/business impact (probability of occurrence combined with impact) from a particular threat source exploiting, or triggering, a particular information technology vulnerability. IT related-risks arise from legal liability or mission/business loss due to: 
1. Unauthorized (malicious, non-malicious, or accidental) disclosure, modification, or destruction of information. 
2. Non-malicious errors and omissions. 
3. IT disruptions due to natural or man-made disasters. 
4. Failure to exercise due care and diligence in the implementation and operation of the IT.
						                            Source(s):
						                            
								                            
                                                                    NIST SP 800-33
										                             [Withdrawn]
									                            
						                            
						                            
						                        
					                            
						                              The net mission/business impact considering (1) the likelihood that a particular threat source will exploit, or trigger, a particular information system vulnerability and (2) the resulting impact if this should occur. IT-related risks arise from legal liability or mission/business loss due to, but not limited to:
1.               Unauthorized (malicious, non-malicious, or accidental) disclosure, modification, or destruction of information.
2.               Non-malicious errors and omissions.
3.               IT disruptions due to natural or man-made disasters.
4.               Failure to exercise due care and diligence in the implementation and operation of the IT.
						                            Source(s):
						                            
								                            
                                                                    NIST SP 800-27 Rev. A
										                             [Withdrawn]