VirtualBox v4.1.20 is released. VirtualBox is a general-purpose full virtualizer for x86/x64 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.

VirtualBox v4.1.20 Changelog:
This is a maintenance release. The following items were fixed and/or added since VirtualBox 4.1.18:
- VMM: fixed a crash under rare circumstances for VMs running without hardware virtualization
- VMM: fixed a code analysis bug for certain displacement instructions for VMs running without hardware virtualization
- VMM: fixed an interpretion bug for TPR read instructions under rare conditions (AMD-V only)
- Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bugs #9604, #10491)
- VBoxSVC: be more tolerant against environment variables with strange encodings (bug #8780)
- VGA: fixed wrong access check which might cause a crash under certain conditions
- NAT: final fix for crashes under rare conditions (bug #10513)
- Virtio-net: fixed the problem with receiving of GSO packets in Windows XP guests causing packet loss in host-to-VM transfers
- HPET: several fixes (bugs #10170, #10306)
- Clipboard: disable the clipboard by default for new VMs
- BIOS: the PCI BIOS was not properly detected with the chipset type set to ICH9 (bugs #9301, #10327)
- Mac OS X hosts: adaptions to Mountain Lion
- Linux Installer: fixes for Gentoo Linux (bug #10642)
- Linux guests: fixed mouse integration on Fedora 17 guests (bug #2306)
- Linux Additions: compile fixes for RHEL/CentOS 6.3 (bug #10756)
- Linux Additions: compile fixes for Linux 3.5-rc1 and Linux 3.6-rc1 (bug #10709)
- Solaris host: fixed a guru meditation while allocating large pages (bug #10600)
- Solaris host: fixed possible kernel panics while freeing memory
- Solaris Installer: fixed missing icon for menu and desktop shortcuts

Download: VirtualBox v4.1.20
Source: Here