has exploited CVE-2021-26855 CVE-2021-26857 CVE-2021-26858 and CVE-2021-27065 to compromise on-premises versions of Microsoft Exchange Server enabling access to email accounts and installation of additional malware.(Citation: Microsoft HAFNIUM March 2020)(Citation: Volexity Exchange Marauder March 2021)(Citation: FireEye Exchange Zero Days March 2021)  
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: List the MITRE techniques contained in the text. ### Input: has exploited CVE-2021-26855 CVE-2021-26857 CVE-2021-26858 and CVE-2021-27065 to compromise on-premises versions of Microsoft Exchange Server enabling access to email accounts and installation of additional malware.(Citation: Microsoft HAFNIUM March 2020)(Citation: Volexity Exchange Marauder March 2021)(Citation: FireEye Exchange Zero Days March 2021)   ### Response: T1190.