CVE-2017-9477: Cisco DPC3939 Firmware

Medium severity, CVSS 6.5. EPSS: 1% chance of exploitation in the next 30 days.

The Comcast firmware on Cisco DPC3939 (firmware version dpc3939-P20-18-v303r20421733-160420a-CMCST) and DPC3939 (firmware version dpc3939-P20-18-v303r20421746-170221a-CMCST) devices allows remote attackers to discover the CM MAC address by connecting to the device's xfinitywifi hotspot.

Affected products

• Cisco DPC3939 Firmware: version dpc3939-p20-18-v303r20421746-170221a-cmcst only; version dpc3939-p20-18-v303r20421733-160420a-cmcst only

Published 2017-07-31. Last modified 2026-06-17.