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CVE Record

CVE-2021-34236: Buffer Overflow in Netgear R8000 Router with firmware v1.0.4.56 allows remote attackers to execute arbitrar...

Buffer Overflow in Netgear R8000 Router with firmware v1.0.4.56 allows remote attackers to execute arbitrary code or cause a denial-of-service by sending a crafted POST to '/bd_genie_create_account.cgi' with a sufficiently long parameter 'register_country'.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-34236 is a reported buffer overflow in Netgear R8000 router firmware v1.0.4.56. A remote attacker could potentially crash the router or execute code by abusing an account-creation CGI request. Business urgency depends on whether this exact model and firmware are deployed and reachable from untrusted networks.

Executive priority

Treat as a high-priority asset exposure check, not a confirmed breach signal. Focus on finding affected routers, reducing management-plane exposure, and following Netgear support guidance because no fixed version is named in the supplied sources.

Technical view

The source record describes a buffer overflow in Netgear R8000 firmware v1.0.4.56 involving the account creation CGI handler and an overly long register_country value. Reported impact is arbitrary code execution or denial of service. The bundle does not provide CVSS, CWE, vendor advisory, or fixed-version evidence.

Likely exposure

Exposure appears limited to Netgear R8000 devices running firmware v1.0.4.56. Risk is highest where router web administration is reachable from the internet, guest networks, or other untrusted segments.

Exploitation context

The CVE is not listed in KEV in the provided bundle, and no cited source confirms active exploitation. Public detail exists in a GitHub bug report, but the evidence set is thin and should be treated as unconfirmed until validated against deployed devices.

Researcher notes

The public record lacks CVSS, CWE mapping, affected CPEs, and a vendor fix reference. Analysis should cite the exact firmware version only and avoid broad Netgear assumptions. Further confirmation from vendor material would materially improve confidence.

Mitigation direction

  • Inventory Netgear R8000 routers and record firmware versions.
  • Check Netgear guidance for R8000 firmware updates or replacement direction.
  • Remove router administration access from untrusted networks.
  • Prioritize upgrade or replacement for exposed devices on firmware v1.0.4.56.
  • Monitor affected routers for crashes, resets, or suspicious admin activity.

Validation and detection

  • Confirm whether any deployed device is Netgear R8000 firmware v1.0.4.56.
  • Verify management interfaces are not internet-accessible.
  • Review firewall rules for guest or untrusted access to router administration.
  • Check device logs for instability or unexpected administrative events.
  • Avoid production crash testing; use vendor-supported validation where available.
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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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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CVE-2021-34236 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

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

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

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.