protocol.c in the Apache HTTP Server 2.2.x through 2.2.21 does not properly restrict header information during construction of Bad Request (aka 400) error documents, which allows remote attackers to obtain the values of HTTPOnly cookies via vectors involving a (1) long or (2) malformed header in conjunction with crafted web script.
Unitrends risk assessment: None if security updates are applied
For CentOS6, Unitrends systems have httpd-2.2.15-54.el6.centos or later,
and this issue was fixed in httpd-2.2.15-15.el6_2.1
LINK TO ADVISORIES