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Need to remove vulnerabilities from server running websence 7.1 with apache

Please help me to resolve the vulnerabilities m getting on my server running websence..

Description:
According to its banner, the version of Apache 2.2 installed on the remote host is older than 2.2.15. Such versions are potentially affected by multiple vulnerabilities : - A TLS renegotiation prefix injection attack is possible. (CVE-2009-3555) - The 'mod_proxy_ajp' module returns the wrong status code if it encounters an error which causes the back-end server to be put into an error state. (CVE-2010-0408) - The 'mod_isapi' attempts to unload the 'ISAPI.dll' when it encounters various error states which could leave call-backs in an undefined state. (CVE-2010-0425) - A flaw in the core sub-request process code can lead to sensitive information from a request being handled by the wrong thread if a multi-threaded environment is used. (CVE-2010-0434)

Risk factor:
Critical

CVSS Base Score:10.0
CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
See also:
http://httpd.apache.org/security/vulnerabilities_22.html

See also:
https://issues.apache.org/bugzilla/show_bug.cgi?id=48359

See also:
http://www.apache.org/dist/httpd/CHANGES_2.2.15

Solution:
Upgrade to Apache version 2.2.15 or later.


Please suggest how to resolve this without affecting running websence on my server..?
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Thanks