CVE-2017-9491: Cisco DPC3939 Firmware

Medium severity, CVSS 5.3. EPSS: 1.3% chance of exploitation in the next 30 days.

The Comcast firmware on Cisco DPC3939 (firmware version dpc3939-P20-18-v303r20421733-160420a-CMCST); Cisco DPC3939 (firmware version dpc3939-P20-18-v303r20421746-170221a-CMCST); Cisco DPC3939B (firmware version dpc3939b-v303r204217-150321a-CMCST); Cisco DPC3941T (firmware version DPC3941_2.5s3_PROD_sey); and Arris TG1682G (eMTA&DOCSIS version 10.0.132.SIP.PC20.CT, software version TG1682_2.2p7s2_PROD_sey) devices does not set the secure flag for cookies in an https session to an administration application, which makes it easier for remote attackers to capture these cookies by intercepting their transmission within an http session.

Affected products

• Cisco DPC3939 Firmware: version dpc3939-p20-18-v303r20421733-160420a-cmcst only; version dpc3939-p20-18-v303r20421746-170221a-cmcst only
• Cisco DPC3939B Firmware: version dpc3939b-v303r204217-150321a-cmcst only
• Cisco DPC3941T Firmware: version dpc3941_2.5s3_prod_sey only
• Commscope Arris TG1682G Firmware: version 10.0.132.sip.pc20.ct only; version tg1682_2.2p7s2_prod_sey only

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