VMware (NYSE: VMW) has downplayed a VMware ESX source code leak, noting that the posted code is nearly a decade old and likely represents no new risks for customers.

The VMware ESX source code leak is getting a lot of buzz on the Internet. But investors and partners -- including cloud services providers -- don't seem overly concerned. Indeed, VMware shares closed around $103.50 the day the source code leak was announced (April 24). Today (April 27), they are trading around $112.50.

When contacted by Talkin' Cloud, five Cloud Services Providers (CSPs) that leverage VMware's virtualization software said they are not overly concerned about the situation but they are in touch with VMware for updates.

VMware is widely installed across the cloud market. Fifty percent of CSPs say they are working with VMware, according to preliminary results from our second-annual Talkin' Cloud 50 survey, which concludes later today.

Meanwhile, Kaspersky Lab, the security software company, says Hardcore Charlie, an anonymous hacker, has claimed responsibility for the source code leak. Threat Post, a Kaspersky Lab news service, has more details here.