Multiple critical vulnerabilities have been found in Internet Explorer. Malicious users can exploit these vulnerabilities to cause denial of service, execute arbitrary code, bypass security restrictions or obtain sensitive information.

Below is a complete list of vulnerabilities

1. An unknwon vulnerabilities can be exploited remotely via a specially designed web site;
2. Use-after-free vulnerability can be exploited remotely via a specially edsigned HTML document.

Internet Explorer versions from 6 to 11

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)

MS advisory
CVE-2015-0043
CVE-2015-0042
CVE-2015-0041
CVE-2015-0040
CVE-2015-0048
CVE-2015-0046
CVE-2015-0045
CVE-2015-0044
CVE-2015-0017
CVE-2015-0038
CVE-2015-0029
CVE-2015-0028
CVE-2015-0050
CVE-2015-0055
CVE-2015-0070
CVE-2015-0053
CVE-2014-8967
CVE-2015-0049
CVE-2015-0051
CVE-2015-0020
CVE-2015-0021
CVE-2015-0026
CVE-2015-0027
CVE-2015-0054
CVE-2015-0025
CVE-2015-0066
CVE-2015-0067
CVE-2015-0019
CVE-2015-0018
CVE-2015-0031
CVE-2015-0030
CVE-2015-0036
CVE-2015-0039
CVE-2015-0022
CVE-2015-0023
CVE-2015-0035
CVE-2015-0052
CVE-2015-0037
CVE-2015-0068
CVE-2015-0069
CVE-2015-0071

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