CVE-2017-9521

9.8 CRITICAL 3% exploit odds Fix listed Code execution Network gear

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 3.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2017-07-31 03:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 01:28 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 3.3% in the next 30 days (EPSS).
Severity: 9.8 CRITICAL (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2017-07-31 03:29 UTC
Last modified: 2026-06-17 01:28 UTC
Exploit probability: 3.3% · EPSS, next 30 days
Record status: Modified

Affected

Cisco dpc3939 Firmware dpc3939-p20-18-v303r20421733-160420a-cmcst
Cisco dpc3939 Firmware 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
Commscope Arris tg1682g Firmware tg1682_2.2p7s2_prod_sey

Attack profile CVSS 3.1 · 9.8

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2017-9521.md and follow it. Check whether this project is affected by CVE-2017-9521. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record