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Category:   Device (Firewall)  >   Cisco ASA Vendors:   Cisco
Cisco ASA 5506W-X WPA2 Protocol Key Reinstallation Attack Lets Remote Users Modify Data on the Target Wireless Network
SecurityTracker Alert ID:  1039571
SecurityTracker URL:
CVE Reference:   CVE-2017-13082   (Links to External Site)
Date:  Oct 16 2017
Impact:   Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 5506W-X with FirePOWER services
Description:   A vulnerability was reported in Cisco ASA 5506W-X. A remote user on the wireless network can modify data on the wireless network.

A remote user within range of the wireless network can record and replay retransmissions of part of the 802.11i 4-way handshake of the WPA and WPA2 protocols to force a reinstallation of certain keys.

A remote user on the wireless network can retransmit the Fast BSS Transition (FT) Reassociation Request and reinstall a previously used pairwise encryption key (PTK-TK).

The vendor has assigned Bug ID CSCvf47808 to this vulnerability for Cisco ASA 5506W-X with FirePOWER Services.

This vulnerability is one of a set of vulnerabilities referred to as KRACK (Key Reinstallation AttaCK).

The original advisory is available at:

Additional information is available at:

[Editor's note: The vulnerability resides in the WPA and WPA2 protocol specification and is not due to incorrect vendor implementation of the standards.]

Mathy Vanhoef and Frank Piessens from Katholieke Universiteit Leuven reported this vulnerability.

Impact:   A remote user on the wireless network can modify data on the wireless network.
Solution:   The vendor has issued a fix (

No solution was available at the time of this entry for versions 8.2, 8.5, and 8.6.

The vendor advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error, State error

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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