Security readout for executives and security teams
Plain-English summary
This CVE is a denial-of-service issue in specific NETGEAR routers, extenders, and WiFi systems. An unauthenticated attacker on an adjacent network could disrupt device availability, but the CVSS impact is limited to low availability loss. The key business risk is local network disruption where affected firmware remains deployed.
Executive priority
Prioritize remediation for business-critical sites, shared WiFi environments, and devices exposed to guests or untrusted local users. This is not a confirmed exploited or data-theft issue, but outdated network edge devices can still create avoidable service disruption.
Technical view
CVE-2019-20717 affects multiple NETGEAR models running firmware before vendor-listed fixed versions. The CVSS 3.0 vector is AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L, indicating adjacent-network reachability, no privileges, no user interaction, and availability-only impact. The source bundle does not describe the vulnerable component or packet-level trigger.
Likely exposure
Exposure is limited to listed NETGEAR devices on vulnerable firmware versions, especially devices reachable by untrusted users on the same or adjacent network segment. Internet-wide exposure is not supported by the provided CVSS vector or sources.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. It also provides no public exploit details. Treat this as a known vendor-advisory denial-of-service risk requiring firmware validation, not as confirmed active exploitation.
Researcher notes
The advisory names affected models and fixed firmware thresholds, but available source data does not identify the vulnerable service, root cause, or reproducible trigger. Validation should focus on asset inventory and firmware comparison rather than exploit testing.
Mitigation direction
- Update affected NETGEAR devices to the fixed firmware versions or later.
- Use the NETGEAR advisory for model-specific firmware guidance.
- Retire or isolate affected devices that cannot be updated.
- Limit untrusted access to adjacent network segments where affected devices operate.
Validation and detection
- Inventory NETGEAR models against the affected device list.
- Compare installed firmware versions with the vendor fixed-version thresholds.
- Confirm updated devices report the expected fixed firmware version or later.
- Check availability monitoring for unexplained device resets or outages.
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-2019-20717 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/A:L/C:N/I:N/PR:N/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:L/C:N/I:N/PR:N/S:U/UI:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
4.3MediumVector: CVSS:3.0/AC:L/AV:A/A:L/C:N/I:N/PR:N/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000061211/Security-Advisory-for-Denial-of-Service-on-Some-Routers-Extenders-and-WiFi-Systems-PSV-2018-0225CVE 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.