mdk3 WPA Downgrade

[lawhsk30]

I run mdk3 mon0 g -t MAC AP and i see:

Deauth cycles:    6  802.1x authentication packets:    0  WEP/Unencrypted packets:    0  Beacons/sec:  10
Deauth cycles:   11  802.1x authentication packets:    0  WEP/Unencrypted packets:    2  Beacons/sec:   9
REALLY BIG WARNING!!! Seems like a client connected to your target AP leaks PLAINTEXT data while authenticating!!
Deauth cycles:   24  802.1x authentication packets:    0  WEP/Unencrypted packets:    4  Beacons/sec:  10
Deauth cycles:   36  802.1x authentication packets:    0  WEP/Unencrypted packets:    5  Beacons/sec:  10
Deauth cycles:   44  802.1x authentication packets:    0  WEP/Unencrypted packets:    6  Beacons/sec:  10

So what does "REALLY BIG WARNING....." mean? I don't know what it is? Can anybody explain for me?
Thank in advane.

[darkAudax]

lawhsk30,

I would venture to say the message is self-explanatory regarding a client connecting and failing to encrypt the communication.  If you want to understand it in detail, I would suggest you review the source code.

d.