CVE-2008-4279: VMware Esx

Medium severity, CVSS 6.8. EPSS: 0.4% chance of exploitation in the next 30 days.

The CPU hardware emulation for 64-bit guest operating systems in VMware Workstation 6.0.x before 6.0.5 build 109488 and 5.x before 5.5.8 build 108000; Player 2.0.x before 2.0.5 build 109488 and 1.x before 1.0.8; Server 1.x before 1.0.7 build 108231; and ESX 2.5.4 through 3.5 allows authenticated guest OS users to gain additional guest OS privileges by triggering an exception that causes the virtual CPU to perform an indirect jump to a non-canonical address.

Affected products

• VMware Esx: from 2.5.4, up to and including 3.5
• VMware Player: from 1.0, before 1.0.8 (fixed in 1.0.8); from 2.0, before 2.0.5 (fixed in 2.0.5)
• VMware Server: from 1.0, before 1.0.8 (fixed in 1.0.8)
• VMware Workstation: from 5.5, before 5.5.8 (fixed in 5.5.8); from 6.0, before 6.0.5 (fixed in 6.0.5)

Published 2008-10-06. Last modified 2026-06-16.