The following table lists the recommended releases for each Cisco WAAS Software major release:
| Not Available. Migrate to 5.x
: Cisco WAAS Sofware releases prior to 4.2.1 are not affected by this vulnerability.
When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices archive at http://www.cisco.com/go/psirt
and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.