Security readout for executives and security teams
Plain-English summary
This is a NETGEAR router and extender firmware flaw where a logged-in user could trigger a stack-based buffer overflow. The public record rates it medium, but the impact is serious if an attacker already has privileged access on the local network: device confidentiality, integrity, and availability may be affected.
Executive priority
Treat this as a practical firmware hygiene and network appliance risk. It is not presented as mass unauthenticated exploitation, but unpatched perimeter or branch networking devices can become high-impact footholds if administrator credentials or local network access are compromised.
Technical view
CVE-2019-20755 is a post-authentication stack-based buffer overflow affecting multiple NETGEAR routers, modem routers, extenders, and Orbi satellites before vendor-listed firmware versions. The CVSS 3.0 vector is adjacent network, low complexity, high privileges, no user interaction, unchanged scope, with high CIA impact.
Likely exposure
Exposure is most likely in homes, branches, labs, or small offices still running listed NETGEAR models below the fixed firmware versions. The CVSS vector indicates adjacent-network access and high privileges are required, so exposure depends heavily on local network access, management access controls, and credential hygiene.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. This is not described as unauthenticated internet exploitation. The main concern is a privileged or credentialed attacker already near the device using the flaw to compromise or disrupt the network appliance.
Researcher notes
The affected-product evidence comes from the CVE description and NETGEAR advisory reference. No CWE is supplied in the bundle. The CVSS vector materially limits exploitability through PR:H and AV:A, while the high CIA impacts justify remediation where listed devices remain deployed.
Mitigation direction
- Upgrade affected NETGEAR devices to the vendor-listed fixed firmware versions or later.
- Confirm device models and firmware against NETGEAR advisory PSV-2018-0053.
- Restrict management interfaces to trusted networks and administrators only.
- Rotate router administrator credentials if compromise is suspected.
- Replace unsupported devices if fixed firmware is unavailable.
Validation and detection
- Inventory NETGEAR routers, modem routers, extenders, and Orbi satellites in use.
- Compare each model and firmware version to the advisory's affected version list.
- Verify management access is not exposed beyond intended trusted networks.
- Check whether any affected devices are end-of-life or lack available updates.
- Document remediation status and residual exposure for each device.
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
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CVE-2019-20755 mapping review
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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/000060627/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-Modem-Routers-Extenders-and-Orbi-Satellites-PSV-2018-0053CVE 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.