Security readout for executives and security teams
Plain-English summary
This CVE describes Comcast firmware on Cisco DPC3939 and DPC3941T gateways where an attacker who can reach the wan0 IPv6 interface may access the web UI using hardcoded credentials. The CVE explicitly says that interface is not reachable from the public Internet, which limits broad external exposure.
Executive priority
Treat this as a targeted infrastructure exposure, not confirmed Internet-wide risk. Prioritize identifying affected customer-premises gateways and confirming management access is not reachable from untrusted networks, especially where these devices support business-critical connectivity.
Technical view
Affected firmware versions are dpc3939-P20-18-v303r20421746-170221a-CMCST on Cisco DPC3939 and DPC3941_2.5s3_PROD_sey on DPC3941T. The issue is hardcoded web UI credentials reachable over a session to the wan0 WAN IPv6 address. No CVSS, CWE, or vendor patch details are provided in the bundle.
Likely exposure
Exposure appears limited to environments where an attacker can route to or otherwise reach the wan0 WAN IPv6 address. The CVE states this interface cannot be accessed from the public Internet, so normal Internet-wide scanning is not supported by the provided evidence.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. It only describes remote access to the web UI after reaching the wan0 IPv6 interface and using unspecified hardcoded credentials. No public exploit status should be assumed from these sources.
Researcher notes
The structured affected vendor/product fields are n/a, but the CVE description names Comcast firmware on Cisco DPC3939 and DPC3941T devices with specific firmware versions. Evidence is incomplete on patch availability, operational mitigations, CVSS scoring, and exploit activity.
Mitigation direction
- Inventory Cisco DPC3939 and DPC3941T devices and record exact firmware versions.
- Check Comcast, Cisco, or operator guidance for patched firmware or replacement options.
- Ensure management web UI access is blocked from untrusted IPv6 network paths.
- Retire or isolate affected gateways if no supported firmware remediation exists.
Validation and detection
- Confirm whether listed firmware versions are present in the environment.
- Verify wan0 IPv6 management UI is not reachable from untrusted network locations.
- Review device management logs for unexpected web UI sessions, if available.
- Document compensating controls for devices that cannot be updated.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2017-9488 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/BastilleResearch/CableTap/blob/master/doc/advisories/bastille-31.stb-remote-webui.txtCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.