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CVE Record

CVE-2019-20685: Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker.

Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker. This affects D3600 before 1.0.0.75, D6000 before 1.0.0.75, D6200 before 1.1.00.32, D7000 before 1.0.1.68, DM200 before 1.0.0.58, JR6150 before 1.0.1.18, PR2000 before 1.0.0.28, R6020 before 1.0.0.38, R6050 before 1.0.1.18, R6080 before 1.0.0.38, R6120 before 1.0.0.46, R6220 before 1.1.0.80, R6260 before 1.1.0.40, R6700v2 before 1.2.0.36, R6800 before 1.2.0.36, R6900v2 before 1.2.0.36, WNR2020 before 1.1.0.62, and XR500 before 2.3.2.32.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This is a high-severity flaw in specific NETGEAR routers, gateways, and modems. An unauthenticated attacker may trigger a stack-based buffer overflow on affected firmware. Businesses using listed models below the fixed versions should prioritize firmware verification and upgrade planning.

Executive priority

Treat this as a near-term remediation item for environments using the listed NETGEAR devices. It is high impact and unauthenticated, but the provided evidence does not establish active exploitation or broad exposure.

Technical view

CVE-2019-20685 is a pre-authentication stack-based buffer overflow affecting named NETGEAR devices before specified firmware versions. CVSS 3.0 is 8.8 with no privileges or user interaction required, high confidentiality, integrity, and availability impact, and adjacent-network attack vector.

Likely exposure

Exposure is limited to the NETGEAR models and firmware versions listed in the CVE description. Organizations with older small-office, home-office, branch, or lab NETGEAR devices should verify model and firmware inventory. The provided sources do not state internet exposure prevalence.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The risk comes from unauthenticated pre-authentication overflow impact on network devices, not from confirmed in-the-wild activity in the provided evidence.

Researcher notes

The bundle provides strong affected-version detail but limited root-cause detail. No CWE is supplied. CVSS vector indicates adjacent-network scope, no privileges, no user interaction, and high CIA impact. Avoid assuming exploit availability beyond the provided sources.

Mitigation direction

  • Inventory listed NETGEAR models and record exact firmware versions.
  • Upgrade affected devices to the fixed firmware version or later.
  • Use NETGEAR advisory guidance for model-specific firmware instructions.
  • Replace devices if fixed firmware is unavailable or unsupported.
  • Restrict administrative reachability according to vendor guidance.

Validation and detection

  • Compare device model and firmware against the CVE affected-version list.
  • Confirm upgraded firmware is at or above the named fixed version.
  • Check NETGEAR advisory for any model-specific notes.
  • Document remaining affected devices and ownership.
  • Monitor CVE and vendor advisory updates for changed guidance.
Prepared
Confidence
high
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-2019-20685 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:N/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
8.8CVSS 3.0HighCVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:N/S:U/UI:N2.85.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

8.8High
CVSS 3.0 vector shape for CVE-2019-20685Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:N/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.