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As an older release, it is subject to several documented CVEs, including potential denial-of-service and code execution vulnerabilities. Download Considerations Cross Platform Release Notes for Cisco IOS Release 15.7(3)M

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: This indicates a "universal" image that contains all Cisco IOS features (e.g., Security, UC, Data). Specific features are enabled via Software Activation licenses . As an older release, it is subject to

If you have a PAK file from Cisco: