Security readout for executives and security teams
Plain-English summary
Certain NETGEAR routers, gateways, and WiFi systems have a stack-based buffer overflow reachable by an authenticated user. The issue is not described as remotely exploitable without credentials, but successful exploitation could severely affect confidentiality, integrity, and availability on impacted devices.
Executive priority
Treat this as a moderate-priority infrastructure hygiene issue. It warrants scheduled remediation, especially for network edge or WiFi infrastructure, but the source evidence does not support emergency handling absent affected exposed devices or known exploitation.
Technical view
CVE-2019-20735 is a post-authentication stack-based buffer overflow affecting listed NETGEAR models before specific firmware versions. CVSS 3.0 is 6.8 with adjacent-network attack vector, low complexity, high privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where listed NETGEAR devices remain on firmware older than the fixed versions named in the CVE description and advisory. Risk is higher if device administration is reachable from broad internal or WiFi networks and multiple users have administrative credentials.
Exploitation context
The provided bundle does not show CISA KEV listing or other evidence of active exploitation. The CVSS vector indicates exploitation requires adjacent-network access and high privileges, so this is more constrained than unauthenticated internet-facing router flaws.
Researcher notes
The strongest evidence is the NETGEAR advisory and CVE record. The bundle provides no vulnerable component, exploit details, CWE, or proof-of-concept status. Validate exposure by model and firmware, and avoid assuming impact beyond the listed products and versions.
Mitigation direction
- Inventory listed NETGEAR models and record current firmware versions.
- Update affected devices to the fixed firmware versions or later.
- Follow NETGEAR advisory guidance for model-specific remediation.
- Restrict administration access to trusted networks and administrators.
- Rotate or remove unnecessary administrative accounts.
- Replace devices if supported firmware is unavailable.
Validation and detection
- Compare each device model and firmware against the affected version list.
- Confirm upgraded devices report the fixed firmware version or later.
- Review whether management interfaces are reachable from untrusted networks.
- Audit administrative accounts for unnecessary or shared access.
- Document any unsupported devices requiring replacement or compensating controls.
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-2019-20735 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/000061191/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-Gateways-and-WiFi-Systems-PSV-2018-0138CVE 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.