7.5

CVE-2017-9478: cisco dpc3939_firmware

CVSS: 7.5v3.0HighModified
Published 31-07-2017Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2017-9478 is a high (CVSS 7.5) vulnerability in cisco dpc3939_firmware. EPSS estimates a 1.51% chance of exploitation in the next 30 days, higher than 74.1% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
1.51%
0%100%
Low · +0.16 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 31-07-2017
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

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 sets the CM MAC address to a value with a two-byte offset from the MTA/VoIP MAC address, which indirectly allows remote attackers to discover hidden Home Security Wi-Fi networks by leveraging the embedding of the MTA/VoIP MAC address into the DNS hostname.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

1.51%

Chance of exploitation in the next 30 days

Percentile

74%

Versus all other CVEs

30-day change

+0.16 pp

From 1.35% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.51%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Cabletap

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Cisco1 product
  • dpc3939_firmwaredpc3939-p20-18-v303r20421746-170221a-cmcst | dpc3939-p20-18-v303r20421733-160420a-cmcst

1 vendor · 1 product

References

1 links