CVE-2017-9485: Cisco DPC3939 Firmware

High severity, CVSS 7.5. 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) devices allows remote attackers to write arbitrary data to a known /var/tmp/sess_* pathname by leveraging the device's operation in UI dev mode.

Affected products

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

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