A method implemented by a computing device for evaluating security for virtualized infrastructures of tenants in a cloud environment, the method comprising: calculating (S100) at least one security metric for a first tenant based at least in part on information associated with at least one virtual resource of the first tenant and at least one interaction of the at least one virtual resource of the first tenant with at least one virtual resource of at least one other tenant in a multi-tenant virtualized infrastructure; and evaluating (S102) at least one security parameter for the first tenant, wherein the at least one security parameter is determined based on at least one of the at least one calculated security metric for monitoring a security level of the first tenant relative to the at least one other tenant in the multi-tenant virtualized infrastructure, wherein the at least one security metric includes at least one of a normalized host sharing metric, a coverage metric and an abundance metric, wherein: the normalized host sharing metric is based on a number of other tenants that are co-located within a host of the at least one virtual resource of the first tenant; the coverage metric is based on a ratio of virtual resources of the first tenant on a host in which there are other virtual resources of the at least one other tenant to a total number of virtual resources of the first tenant in the multi-tenant virtualized infrastructure; and the abundance metric is based on a number of virtual resources of the first tenant on a host divided by a total number of virtual resources on the host. calculating (S100) at least one security metric for a first tenant based at least in part on information associated with at least one virtual resource of the first tenant and at least one interaction of the at least one virtual resource of the first tenant with at least one virtual resource of at least one other tenant in a multi-tenant virtualized infrastructure; and evaluating (S102) at least one security parameter for the first tenant, wherein the at least one security parameter is determined based on at least one of the at least one calculated security metric for monitoring a security level of the first tenant relative to the at least one other tenant in the multi-tenant virtualized infrastructure, wherein the at least one security metric includes at least one of a normalized host sharing metric, a coverage metric and an abundance metric, wherein: the normalized host sharing metric is based on a number of other tenants that are co-located within a host of the at least one virtual resource of the first tenant; the coverage metric is based on a ratio of virtual resources of the first tenant on a host in which there are other virtual resources of the at least one other tenant to a total number of virtual resources of the first tenant in the multi-tenant virtualized infrastructure; and the abundance metric is based on a number of virtual resources of the first tenant on a host divided by a total number of virtual resources on the host. the normalized host sharing metric is based on a number of other tenants that are co-located within a host of the at least one virtual resource of the first tenant; the coverage metric is based on a ratio of virtual resources of the first tenant on a host in which there are other virtual resources of the at least one other tenant to a total number of virtual resources of the first tenant in the multi-tenant virtualized infrastructure; and the abundance metric is based on a number of virtual resources of the first tenant on a host divided by a total number of virtual resources on the host. <EOS>