Security readout for executives and security teams
Plain-English summary
This flaw affects specific NETGEAR routers, gateways, and extenders. An unauthenticated nearby network attacker could trigger a buffer overflow with high impact to confidentiality, integrity, and availability. The main business risk is compromise or disruption of network edge equipment that may sit in homes, small offices, or branch sites.
Executive priority
Prioritize remediation where these devices support business connectivity, remote offices, or privileged network segments. The vulnerability is high severity and pre-authentication, but the provided evidence does not support claiming known active exploitation.
Technical view
CVE-2018-21215 is a pre-authentication buffer overflow affecting listed NETGEAR device models before specified firmware versions. CVSS 3.0 is 8.8 with adjacent-network attack vector, low complexity, no privileges, and no user interaction. The source bundle does not provide CWE, vulnerable endpoint, or exploit mechanics.
Likely exposure
Exposure is limited to organizations using the named NETGEAR D3600, D6000, D6100, EX2700, R7500v2, R9000, WN2000RPTv3, WN3000RPv3, or WN3100RPv2 models on vulnerable firmware. The CVSS vector indicates adjacent-network exposure rather than confirmed Internet-wide reach.
Exploitation context
The provided sources do not show CISA KEV listing or other evidence of active exploitation. The issue is still serious because it is unauthenticated, low-complexity, pre-authentication, and can affect all three security properties with high impact.
Researcher notes
The record lacks CWE, CPE detail, affected service, and exploit-path detail. Use firmware and model validation as the primary assessment method. Avoid assuming broader NETGEAR impact beyond the models and versions explicitly listed in the sources.
Mitigation direction
- Upgrade affected NETGEAR models to the fixed firmware versions named in the advisory.
- Restrict device management access to trusted local networks until firmware status is confirmed.
- Replace affected devices that cannot run fixed firmware.
- Check NETGEAR guidance for model-specific update and support status.
Validation and detection
- Inventory network devices for the exact NETGEAR models listed in the CVE description.
- Compare installed firmware against the fixed versions named for each model.
- Verify no vulnerable model remains exposed on untrusted or guest-adjacent networks.
- Document unsupported or unpatchable devices for replacement tracking.
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-2018-21215 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
- 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
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:N/S:U/UI:N2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.8HighVector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:N/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000055122/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-Gateways-and-Extenders-PSV-2017-2486CVE 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.