Security readout for executives and security teams
Plain-English summary
This is a post-authentication stack overflow in several older NETGEAR routers and modem routers. A highly privileged authenticated user on an adjacent network could potentially compromise confidentiality, integrity, and availability. The main business concern is unmanaged or forgotten network hardware still running firmware older than NETGEAR's listed fixed versions.
Executive priority
Treat this as a moderate-priority network hygiene issue. It is not documented as actively exploited in the provided sources, but affected routers are security boundary devices and should not remain on vulnerable firmware.
Technical view
CVE-2019-20767 affects listed NETGEAR D-series, R-series, WNDR, and WNR devices before specific firmware versions. The CVSS 3.0 vector is AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, meaning adjacent access and high privileges are required, but impact is high if exploited.
Likely exposure
Exposure is most likely where affected NETGEAR routers or modem routers remain in use with firmware below the versions named in the CVE description. Risk is concentrated around administrative access paths reachable from local or adjacent network segments.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The vulnerability is post-authentication and requires high privileges, reducing broad internet-scale risk, but compromise of router administration credentials could make the impact serious.
Researcher notes
The bundle identifies a stack-based buffer overflow but does not provide endpoint, function, CWE, proof-of-concept, or exploit telemetry. Analysis should stay focused on firmware/version validation, authenticated administrative exposure, and vendor advisory tracking.
Mitigation direction
- Inventory for the affected NETGEAR models listed in the advisory and CVE record.
- Upgrade affected devices to at least the firmware versions named in the CVE description.
- Check NETGEAR's advisory for current firmware guidance and support status.
- Restrict router administration access to trusted management networks and users.
- Retire unsupported devices if fixed firmware is unavailable or cannot be validated.
Validation and detection
- Confirm each device model and firmware version against the CVE's affected-version list.
- Verify administrative interfaces are not reachable from untrusted local or adjacent networks.
- Review device logs for unexpected administrative logins or configuration changes.
- Check whether affected hardware remains deployed in offices, labs, branches, or homes.
- Document remediation status for each listed NETGEAR model found.
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-2019-20767 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
- 6.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:H/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:L/AV:A/A:H/C:H/I:H/PR:H/S:U/UI:N0.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.8MediumVector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:H/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000060632/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-and-Modem-Routers-PSV-2018-0116CVE 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.