ESA-15: Web Services Denial Of Service Vulnerability

Eucalyptus Security Advisory
Advisory ID: 
Severity Level: 
Issue Date: 
Last Updated: 
Affected Products: 
Eucalyptus 2.0 to Eucalyptus 3.4.1


A security issue has been identified in the way Eucalyptus Java-based components handle network connections to web services APIs. All versions of Eucalyptus starting from 2.0 are affected. An update is now available in 3.4.2 that resolves this issue. We advise immediately updating all affected Eucalyptus installations.


A flaw was identified in the network connection clean up code that allows for Denial of Service attacks against Eucalyptus web services APIs by remote, unauthenticated attackers. All Java-based components are affected, including Cloud Controller (CLC), Walrus, Storage Controller (SC), and VMware Broker (VB).


Restricting network access to Eucalyptus web services APIs to trusted clients only (if possible) can help preventing intentional DoS attacks. Please refer the Administration Guide at for Eucalyptus open ports and connectivity rules.


Eucalyptus 3.4.2 resolves this issue.

Please see for instructions on downloading and upgrading to the latest Eucalyptus software.

Contact and Help

Contact the Eucalyptus Security Team at