An Analysis of the DHEat DoS Against SSH in Cloud Environments

"The DHEat attack remains viable against most SSH installations, as default settings are inadequate at deflecting it. Very little bandwidth is needed to cause a dramatic effect on targets, including those with a high degree of resources. Hence, SSH services should be blocked from external access whenever possible. Furthermore, connection rate limiting should always be applied regardless of network segmentation, as per the central principles of Zero Trust."