AirPort Base Station Firmware Update 7.7.9 - Update using AirPort Utility.

Note: Install the update using AirPort Utility (located in /Applications/Utilities/).

The AirPort Base Station Firmware Update is recommended for all AirPort Extreme and AirPort Time Capsule base stations with 802.11ac. It provides security improvements related to SSL/TLS. Version 7.7.9:

Firmware update 7.7.9 improves the security of your base station and is recommended for all AirPort Extreme and AirPort Time Capsule base stations with 802.11ac.
AirPort Base Station Firmware
Available for: AirPort Extreme and AirPort Time Capsule base stations with 802.11ac
Impact: An attacker within range may be able to execute arbitrary code on the Wi-Fi chip
Description: A memory corruption issue was addressed with improved memory handling.
AirPort Base Station Firmware
Available for: AirPort Extreme and AirPort Time Capsule base stations with 802.11ac
Impact: An attacker in Wi-Fi range may force nonce reuse in WPA unicast/PTK clients (Key Reinstallation Attacks - KRACK)
Description: A logic issue existed in the handling of state transitions. This was addressed with improved state management.
AirPort Base Station Firmware
Available for: AirPort Extreme and AirPort Time Capsule base stations with 802.11ac
Impact: An attacker in Wi-Fi range may force nonce reuse in WPA multicast/GTK clients (Key Reinstallation Attacks - KRACK)
Description: A logic issue existed in the handling of state transitions. This was addressed with improved state management.

OS X 10.8 or later
AirPort Extreme and AirPort Time Capsule base stations with 802.11ac.
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