What is CVE-2017-9487?

CVE-2017-9487 is a medium-severity vulnerability in Cisco Dpc3939, classified under Information Disclosure. CVSS score: 5.9/10. Published 2017-07-31.

How severe is CVE-2017-9487?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Information disclosure in Cisco Dpc3939

CVE-2017-9487

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.

Vulnerability class: Information Disclosure

Published 2017-07-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.012 (66.3th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Cisco Dpc3939
Cisco Dpc3939 Firmware — versions dpc3939-p20-18-v303r20421746-170221a-cmcst
Cisco Dpc3941t
Cisco Dpc3941t Firmware — versions dpc3941_2.5s3_prod_sey

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

github.com/BastilleResearch/CableTap/blob/master/doc/advisories/bastille-30.wan… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2017-9487?: CVE-2017-9487 is a medium-severity vulnerability in Cisco Dpc3939, classified under Information Disclosure. CVSS score: 5.9/10. Published 2017-07-31.
How severe is CVE-2017-9487?: Medium severity. CVSS v3 base score is 5.9 out of 10.