Security readout for executives and security teams
Plain-English summary
This is a NETGEAR router and WiFi-system vulnerability where an already authenticated user could trigger a stack-based buffer overflow. The business risk is mainly for organizations still running older firmware on the listed devices, especially where administrative access is broadly available on internal or adjacent networks.
Executive priority
Treat this as a targeted firmware hygiene issue rather than an internet-wide emergency. Prioritize updates for listed NETGEAR devices used in business, remote-office, or high-trust network roles, especially where administrative access controls are weak.
Technical view
CVE-2019-20748 is a post-authentication stack-based buffer overflow in certain NETGEAR D7800, R7500v2, R7800, Orbi RBK/RBR/RBS20, RBK/RBS40, and RBK/RBR/RBS50 devices before the firmware versions listed by NETGEAR. CVSS 3.0 is 6.8 with adjacent-network attack vector and high privileges required.
Likely exposure
Exposure is limited to the named NETGEAR models running vulnerable firmware. The CVSS vector indicates adjacent-network access and high privileges are required, so risk is higher where device administration is shared, weakly controlled, or reachable from less trusted networks.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The flaw requires authentication, but successful exploitation could affect confidentiality, integrity, and availability according to the CVSS impacts.
Researcher notes
Source evidence is limited to the CVE record and NETGEAR advisory reference. No exploit details, root cause depth, or confirmed exploitation are included in the supplied bundle. Validation should focus on model, firmware, administrative exposure, and vendor-fixed-version alignment.
Mitigation direction
- Inventory the listed NETGEAR models and current firmware versions.
- Upgrade affected devices to NETGEAR’s fixed firmware versions or later.
- Restrict device administration to trusted management networks.
- Limit administrator accounts to authorized users only.
- Review the NETGEAR advisory for model-specific guidance.
Validation and detection
- Compare each device model and firmware against NETGEAR’s affected-version list.
- Confirm vulnerable firmware versions are no longer present in production.
- Verify administrative interfaces are not reachable from untrusted networks.
- Review admin account lists for unnecessary or shared access.
- Monitor the CVE and vendor advisory for updates.
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-2019-20748 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/000060963/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-Gateways-and-WiFi-Systems-PSV-2018-0147CVE 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.