Multiple security issues and vulnerabilities within the WPA2 standard have been identified and publicized by Mr. Mathy Vanhoef of KU Leuven. These vulnerabilities may allow the reinstallation of a pairwise transient key, a group key, or an integrity key on either a wireless client or a wireless access point (AP). In consequence, an attacker could establish a man-in-the-middle position between AP and client facilitating packet decryption and injection.
The Field Xpert SFX370 and SFX350 handhelds are manufactured by Pepperl+Fuchs/ecom instruments for Endress+Hauser.
The Advisory for Pepperl+Fuchs/ecom instruments can be found here: VDE-2017-005