Check Your Cisco IOS Software
Use the Cisco IOS Software Checker tool to search for Cisco Security Advisories that address specific Cisco IOS Software releases. Simply select a release from the drop-down menu, paste in show version command output, or upload a file from your local system. Please note that the Cisco IOS Software Checker does not support Cisco IOS XE Software, IOS XR Software, or interim builds of Cisco IOS Software. A high-resolution video describing the tool is available on YouTube.