One such vulnerability that has caused pretty much all manufacturers to scurry around issuing fixes is the latest Stagefright vulnerability, which could leave your device at risk by simply receiving an MMS video.
Google announced that it would patch the vulnerability immediately, and whilst the OTA trickled out to a select few, the patch for Stagefright for the Nexus devices is now available to all. If the update isn’t triggering for you, then you can go ahead and use the download links below and flash directly onto your device.
Nexus OTA Download Links
Be sure to check what build applies to you before flashing.