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CVE Record

CVE-2019-20766: NETGEAR R7800 devices before 1.0.2.52 are affected by a stack-based buffer overflow by an authenticated user.

NETGEAR R7800 devices before 1.0.2.52 are affected by a stack-based buffer overflow by an authenticated user.

MediumCVSS 6.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

NETGEAR R7800 routers running firmware before 1.0.2.52 have a post-authentication stack overflow issue. An attacker would need high-privilege authenticated access and adjacent network reachability, but successful exploitation could compromise confidentiality, integrity, and availability of the device.

Executive priority

Treat this as a targeted infrastructure hygiene issue, not an emergency based on current evidence. Prioritize remediation where R7800 routers protect sensitive networks or have broadly reachable administration.

Technical view

CVE-2019-20766 is a stack-based buffer overflow in NETGEAR R7800 firmware before 1.0.2.52. The CVSS 3.0 vector indicates adjacent-network access, low complexity, high privileges required, no user interaction, and high impact to confidentiality, integrity, and availability.

Likely exposure

Exposure is limited to NETGEAR R7800 devices on firmware older than 1.0.2.52, especially where administrative access is reachable from untrusted local or adjacent networks.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Risk depends heavily on privileged credential access and management-plane network exposure.

Researcher notes

The public data is sparse: no CWE is listed in the bundle, and only the vendor advisory is referenced. Validation should focus on firmware state, privilege boundaries, and management-plane exposure rather than exploit reproduction.

Mitigation direction

  • Upgrade NETGEAR R7800 firmware to 1.0.2.52 or later if still below that version.
  • Check the NETGEAR advisory for current vendor guidance before making production changes.
  • Restrict router administration to trusted management networks only.
  • Review and rotate privileged router credentials where exposure is suspected.
  • Disable unnecessary administrative access paths where operationally possible.

Validation and detection

  • Inventory NETGEAR R7800 devices and record firmware versions.
  • Confirm no R7800 device remains below firmware 1.0.2.52.
  • Verify administrative interfaces are not reachable from untrusted local segments.
  • Review router admin accounts for unnecessary privileged users.
  • Document compensating controls for devices that cannot be upgraded immediately.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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-2019-20766 mapping review

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Vulnerability profileCVE Program record
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

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
6.8CVSS 3.0MediumCVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:H/S:U/UI:N0.95.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

6.8Medium
CVSS 3.0 vector shape for CVE-2019-20766Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:H/S:U/UI:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.