Security readout for executives and security teams
Plain-English summary
Some NETGEAR routers and gateways shipped with a hardcoded password issue. If an affected device runs older firmware, an attacker meeting the stated access conditions could compromise sensitive settings or traffic integrity. This is not listed as known exploited in CISA KEV, but edge networking equipment should be prioritized for verification.
Executive priority
Prioritize confirmation and firmware remediation during the next network maintenance window. Escalate sooner for business edge devices, guest networks, or locations without centralized asset management, because hardcoded credential issues can undermine trust in network administration.
Technical view
CVE-2019-20656 is a hardcoded password flaw affecting listed NETGEAR D-series, R-series, PR2000, JR6150, and WNR2020 devices before vendor-specified firmware versions. CVSS 3.0 is 6.4, with adjacent-network access, high attack complexity, low privileges, no user interaction, and high confidentiality and integrity impact.
Likely exposure
Exposure is most likely in small office, branch, home office, and unmanaged environments still running older firmware on the named NETGEAR models. The CVE data does not identify cloud services, enterprise appliances beyond the listed models, or exposure outside affected device firmware.
Exploitation context
The source bundle does not show active exploitation, public exploit use, or KEV listing. CVSS indicates exploitation requires adjacent-network access and low privileges, with high attack complexity. Do not assume internet-wide exploitability from the provided evidence alone.
Researcher notes
The bundle names affected models and fixed version thresholds but does not provide protocol details, credential values, exploit method, or CWE mapping. Analysis should stay at exposure validation and remediation planning unless the vendor advisory supplies additional technical detail.
Mitigation direction
- Identify whether any listed NETGEAR models exist in the environment.
- Update affected devices to the fixed firmware version or later.
- Use the NETGEAR advisory for model-specific firmware guidance.
- Replace devices that cannot receive supported fixed firmware.
- Limit management access to trusted administrative networks.
Validation and detection
- Inventory router and gateway model numbers against the affected NETGEAR list.
- Record current firmware versions and compare with the fixed-version thresholds.
- Check whether management interfaces are restricted from untrusted networks.
- Confirm remediation by rechecking firmware after update or replacement.
- Document any unsupported device exceptions and compensating controls.
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.
Credential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-20656 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
- Medium
- CVSS
- 6.4 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:H/AV:A/A:N/C:H/I:H/PR:L/S:U/UI:N
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AC:H/AV:A/A:N/C:H/I:H/PR:L/S:U/UI:N1.25.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.4MediumVector: CVSS:3.0/AC:H/AV:A/A:N/C:H/I:H/PR:L/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000061483/Security-Advisory-for-Hardcoded-Password-on-Some-Routers-and-Gateways-PSV-2018-0623CVE reference · x_refsource_CONFIRM
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.