The ESXi host must configure the firewall to block network traffic by default.
An XCCDF Rule
Description
<VulnDiscussion>In addition to service-specific firewall rules, ESXi has a default firewall rule policy to allow or deny incoming and outgoing traffic. Reduce the risk of attack by ensuring this is set to deny incoming and outgoing traffic.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-256418r886035_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
From an ESXi shell, run the following command:
# esxcli network firewall set --default-action=false
or