The web services APIs in Eucalyptus 2.0 through 3.4.1 allow remote attackers to cause a denial of service via vectors related to the "network connection clean up code" and (1) Cloud Controller (CLC), (2) Walrus, (3) Storage Controller (SC), and (4) VMware Broker (VB).
Walrus in Eucalyptus before 3.2.2 allows remote attackers to cause a denial of service (memory, thread, and CPU consumption) via a crafted XML message containing a DTD, as demonstrated by a bucket-logging request.