Static Vulnerabilities

When you keep the same secret key static for too long, the IV will be
modified every so often with each MAC protocol data unit (MPDU). The
frequency at which the IV values are modified depends on the level of
privacy needed by the WEP algorithm. If the IV is changed after each
MPDU, you are in the best position to keep WEP intact on your WLAN.
One of the greatest problems in 802.11 security is that there are a
number of difficulties with the key management protocol in WEP. When
dealing with a wireless workstation, the problem is more pervasive. Furthermore,
there is no good implementation of either authentication or
encryption services when working in in “ad hoc mode.”
The security options for access control do not work as well as they
should for larger-scale network infrastructures because there is no
interaccess point protocol (IAPP), which makes key management much
more problematic when wireless stations roam between access points
along your network.