CentOS Errata and Bugfix Advisory 2015:0244 

Upstream details at : https://rhn.redhat.com/errata/RHBA-2015-0244.html

The following updated files have been uploaded and are currently 
syncing to the mirrors: ( sha256sum Filename ) 

i386:
8a65b7fef64f6cf48889b896f6a47c0ed4503b0ec7aeed2b2515972ededcd1b7  busybox-1.15.1-21.el6_6.i686.rpm
c01c8f78c58ebe47136902d76f959f2ccb5da9414e72511445711ef8983cc33d  busybox-petitboot-1.15.1-21.el6_6.i686.rpm

x86_64:
68189894c6f04cc2862e4c37f03d191e7eee3c2a72e412203e1b8ee93e0e9599  busybox-1.15.1-21.el6_6.x86_64.rpm
2acdc4229d7fa197fea79c072129e1b9e200694d9d08db9e3fea054f0f244eb9  busybox-petitboot-1.15.1-21.el6_6.x86_64.rpm

Source:
68a8fe0335f9ba1fc6905cd66259bd9b953e5b0c86555bd7101e047ed7114972  busybox-1.15.1-21.el6_6.src.rpm