CVE-2017-9484: Cisco DPC3939 Firmware

High severity, CVSS 7.5. EPSS: 1.5% 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 a CM MAC address by sniffing Wi-Fi traffic and performing simple arithmetic calculations.

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.