Ekahau B4 staff badge tag 5.7 with firmware 1.4.52, Real-Time Location System (RTLS) Controller 6.0.5-FINAL, and Activator 3 uses part of the MAC address as part of the RC4 setup key, which makes it easier for remote attackers to guess the key via a brute-force attack.

Ekahau B4 staff badge tag 5.7 with firmware 1.4.52, Real-Time Location System (RTLS) Controller 6.0.5-FINAL, and Activator 3 reuses the RC4 cipher stream, which makes it easier for remote attackers to obtain plaintext messages via an XOR operation on two ciphertexts.