Security readout for executives and security teams
Plain-English summary
CVE-2019-20723 is a NETGEAR router, gateway, and extender flaw where a signed-in administrator-level user could trigger a stack buffer overflow. The issue affects specific models running firmware older than fixed versions listed by NETGEAR. Business urgency is moderate unless these devices manage sensitive networks or use weak/shared admin credentials.
Executive priority
Treat this as a moderate-priority network infrastructure hygiene issue. Prioritize branch offices, remote sites, and sensitive environments using listed NETGEAR models. The flaw needs privileged access, but affected routers and extenders can become high-impact control points if administrator access is lost.
Technical view
The vulnerability is a post-authentication stack-based buffer overflow in certain NETGEAR devices. The CVSS 3.0 vector indicates adjacent-network access, low attack complexity, high privileges required, no user interaction, and high confidentiality, integrity, and availability impact. The source bundle does not identify a CWE, vulnerable endpoint, exploit method, or proof of exploitation.
Likely exposure
Exposure is limited to the named NETGEAR D-series, DM, EX, R, WN, WNDR, WNR, and XR500 models below the listed firmware versions. Risk is most relevant where device administration is reachable from local or adjacent networks and administrative credentials are compromised, shared, or poorly controlled.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not report active exploitation. The CVSS vector requires high privileges and adjacent-network access, reducing opportunistic internet-scale risk. Impact can still be serious if an attacker already has administrative access to affected network equipment.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, and NETGEAR advisory reference. Do not assume unauthenticated exploitation, internet reachability, or confirmed exploitation from the provided data. Research should focus on model and firmware confirmation, management-plane exposure, and vendor firmware status.
Mitigation direction
- Inventory NETGEAR devices against the affected model list.
- Upgrade affected devices to NETGEAR's fixed firmware versions or newer.
- Review the NETGEAR advisory for model-specific firmware guidance.
- Limit management access to trusted administrators and trusted networks.
- Rotate device admin credentials if compromise or sharing is suspected.
Validation and detection
- Confirm each device model and current firmware version.
- Compare firmware versions with the CVE description and NETGEAR advisory.
- Verify upgraded devices report fixed firmware or newer.
- Check whether administrative interfaces are reachable from untrusted networks.
- Review admin account use for shared, stale, or suspicious access.
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-2019-20723 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/000061205/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-Gateways-and-Extenders-PSV-2018-0146CVE 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.