Security readout for executives and security teams
Plain-English summary
Some NETGEAR routers and gateways allow a logged-in administrator to trigger a stack buffer overflow. If exploited, it could compromise confidentiality, integrity, and availability of the device, but the source requires authenticated, adjacent-network access and does not show known active exploitation.
Executive priority
Treat as a scheduled but real remediation item. Prioritize business locations using affected NETGEAR devices, especially where shared networks, third-party access, or weak administrative controls increase exposure.
Technical view
CVE-2019-20736 is a post-authentication stack-based buffer overflow affecting specified NETGEAR D6000, D6100, R7800, R8900, R9000, WNDR, WNR2000v5, and XR500 firmware versions before vendor-listed releases. CVSS 3.0 is 6.8 with AV:A, PR:H, UI:N, and high C/I/A impact.
Likely exposure
Exposure is most likely on older NETGEAR routers or gateways running firmware below the listed fixed versions, especially where administration is reachable from untrusted local or adjacent networks.
Exploitation context
The source bundle does not cite public exploitation or CISA KEV listing. Exploitation requires authentication with high privileges and adjacent-network access, which lowers broad internet-scale risk but still matters for shared, hostile, or compromised networks.
Researcher notes
The CVE source provides affected model and firmware thresholds but no CWE entry, exploit detail, or active exploitation evidence. Product detail is drawn from the description and NETGEAR advisory reference, not from structured CPE data.
Mitigation direction
- Update affected NETGEAR devices to firmware at or above the vendor-listed versions.
- Review NETGEAR advisory PSV-2018-0133 for model-specific firmware guidance.
- Restrict router administration to trusted management networks and trusted administrators.
- Disable remote or unnecessary administrative exposure where supported.
- Replace or retire devices that cannot receive vendor-supported firmware.
Validation and detection
- Inventory NETGEAR device models and firmware versions across the environment.
- Compare each version against the CVE description and NETGEAR advisory thresholds.
- Confirm administrative interfaces are not reachable from untrusted networks.
- Check whether affected models remain in service after remediation.
- Document any devices awaiting vendor guidance, replacement, or exception approval.
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-2019-20736 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/000061190/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-and-Gateways-PSV-2018-0133CVE 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.