What’s Vulnerable › Vulnerabilities

CVE-2017-9521

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2017-07-31 · updated 2026-06-17

Description

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 allows remote attackers to execute arbitrary code via a specific (but unstated) exposed service. NOTE: the scope of this CVE does NOT include the concept of "Unnecessary Services" in general; the scope is only a single service that is unnecessarily exposed, leading to remote code execution. The details of that service might be disclosed at a later date.

Affected products

• Cisco Dpc3939 Firmware: dpc3939-p20-18-v303r20421733-160420a-cmcst, dpc3939-p20-18-v303r20421746-170221a-cmcst
• Cisco Dpc3939B Firmware: dpc3939b-v303r204217-150321a-cmcst
• Cisco Dpc3941T Firmware: dpc3941_2.5s3_prod_sey
• Commscope Arris Tg1682G Firmware: 10.0.132.sip.pc20.ct, tg1682_2.2p7s2_prod_sey

References

• https://github.com/BastilleResearch/CableTap/blob/master/doc/advisories/bastille-32.unnecessary-services.txt
• https://github.com/BastilleResearch/CableTap/blob/master/doc/advisories/bastille-32.unnecessary-services.txt

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