Security readout for executives and security teams
Plain-English summary
Certain older NETGEAR extenders, gateways, and routers have a post-authentication stack overflow. An already authenticated user could potentially take serious control-impacting actions. The issue is medium severity because exploitation requires high privileges and adjacent-network access, but the impact is high if a vulnerable device is reached.
Executive priority
Treat this as a moderate-priority infrastructure hygiene issue. It is not evidenced as actively exploited here, but affected edge and network devices can create serious business risk if old firmware and weak administration practices remain in place.
Technical view
CVE-2019-20751 is a stack-based buffer overflow affecting listed NETGEAR models before specific firmware versions. CVSS v3.0 is 6.8 with AV:A, PR:H, AC:L, UI:N, and high confidentiality, integrity, and availability impact. The CVE bundle does not provide the affected function, endpoint, CWE, or exploit mechanics.
Likely exposure
Exposure is most likely in environments still running the named NETGEAR models below the fixed firmware versions. The CVSS vector indicates adjacent-network access and high privileges are required, so risk concentrates around compromised admin credentials, shared management networks, or poorly controlled device administration.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation should not be assumed from this bundle. The evidence supports a post-authenticated, adjacent-network attack path with potentially high device impact if the attacker already has sufficient privileges.
Researcher notes
The source bundle names many specific model-version thresholds, but the structured affected product fields are marked n/a and no CWE is listed. Do not infer endpoint details or exploitability beyond the CVE text, CVSS vector, and NETGEAR advisory.
Mitigation direction
- Inventory the listed NETGEAR models and record current firmware versions.
- Upgrade affected devices to the NETGEAR fixed firmware versions or later.
- Restrict device administration to trusted admins and trusted management networks.
- Review NETGEAR advisory guidance for model-specific update instructions.
- Replace devices that cannot receive supported fixed firmware.
Validation and detection
- Confirm each listed model is not running below its fixed firmware version.
- Check that administrative access is limited to trusted network locations.
- Review admin account ownership and remove unnecessary privileged access.
- Document any vulnerable devices awaiting upgrade or replacement.
- Monitor vendor guidance for any later remediation notes.
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-2019-20751 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/000060964/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Extenders-Gateways-and-Routers-PSV-2018-0171CVE 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.