CVE-2017-9487: Cisco DPC3939 Firmware

Medium severity, CVSS 5.9. EPSS: 1.2% chance of exploitation in the next 30 days.

The Comcast firmware on Cisco DPC3939 (firmware version dpc3939-P20-18-v303r20421746-170221a-CMCST) and DPC3941T (firmware version DPC3941_2.5s3_PROD_sey) devices allows remote attackers to discover a WAN IPv6 IP address by leveraging knowledge of the CM MAC address.

Affected products

• Cisco DPC3939 Firmware: version dpc3939-p20-18-v303r20421746-170221a-cmcst only
• Cisco DPC3941T Firmware: version dpc3941_2.5s3_prod_sey only

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