What is CVE-2017-9477?

CVE-2017-9477 is a medium-severity vulnerability in Cisco Dpc3939, classified under Information Disclosure. CVSS score: 6.5/10. Published 2017-07-31.

How severe is CVE-2017-9477?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Information disclosure in Cisco Dpc3939

CVE-2017-9477

The Comcast firmware on Cisco DPC3939 (firmware version dpc3939-P20-18-v303r20421733-160420a-CMCST) and DPC3939 (firmware version dpc3939-P20-18-v303r20421746-170221a-CMCST) devices allows remote attackers to discover the CM MAC address by connecting to the device's xfinitywifi hotspot.

Vulnerability class: Information Disclosure

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

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Cisco Dpc3939
Cisco Dpc3939 Firmware — versions dpc3939-p20-18-v303r20421746-170221a-cmcst, dpc3939-p20-18-v303r20421733-160420a-cmcst

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

github.com/BastilleResearch/CableTap/blob/master/doc/advisories/bastille-19.wif… (Exploit, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2017-9477?: CVE-2017-9477 is a medium-severity vulnerability in Cisco Dpc3939, classified under Information Disclosure. CVSS score: 6.5/10. Published 2017-07-31.
How severe is CVE-2017-9477?: Medium severity. CVSS v3 base score is 6.5 out of 10.