This is the best summary I could come up with:

The vulnerabilities, which collectively have been dubbed PixieFail by the researchers who discovered them, pose a threat mostly to public and private data centers and possibly other enterprise settings.

People with even minimal access to such a network—say a paying customer, a low-level employee, or an attacker who has already gained limited entry—can exploit the vulnerabilities to infect connected devices with a malicious UEFI.

By installing malicious firmware that runs prior to the loading of a main OS, UEFI infections can’t be detected or removed using standard endpoint protections.

The malicious image in this scenario will establish a permanent beachhead on the device that’s installed prior to the loading of the OS and any security software that would normally flag infections.

This kind of access may be possible when someone has a legitimate account with a cloud service or after first exploiting a separate vulnerability that gives limited system rights.

When the client-{based server] boots, the attacker just needs to send the client a malicious packet in the [request] response that will trigger some of these vulns.

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