The Z-Wave specification requires that S2 security can be downgraded to S0 or other less secure protocols, allowing an attacker within radio range during pairing to downgrade and then exploit a different vulnerability (CVE-2013-20003) to intercept and spoof traffic.
[
{
"product": "Z-Wave",
"vendor": "Silicon Labs",
"versions": [
{
"status": "affected",
"version": "S2"
}
]
}
]