The Clear Channel Assessment (CCA) algorithm in the IEEE 802.11 wireless protocol, when using DSSS transmission encoding, allows remote attackers to cause a denial of service via a certain RF signal that causes a channel to appear busy (aka "jabber"), which prevents devices from transmitting data.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16138
http://www.securityfocus.com/bid/10342
http://www.kb.cert.org/vuls/id/106678
http://www.auscert.org.au/render.html?it=4091
http://support.avaya.com/elmodocs2/security/ASA-2004-009.pdf
http://securitytracker.com/id?1010152
http://archives.neohapsis.com/archives/fulldisclosure/2004-05/0631.html