Security readout for executives and security teams
Plain-English summary
This is a high-severity flaw in several older NETGEAR routers and gateways. An unauthenticated attacker on an adjacent network could trigger a buffer overflow before login. For affected devices, the business risk is compromise or disruption of edge networking equipment, especially where old firmware remains deployed.
Executive priority
Treat this as a priority patching and replacement issue for legacy NETGEAR edge devices. It is high impact, unauthenticated, and pre-login, but provided evidence does not show known active exploitation.
Technical view
CVE-2018-21222 is a pre-authentication buffer overflow affecting listed NETGEAR D-series, R-series, WNDR, and WNR2000v5 devices before specified firmware versions. CVSS 3.0 is 8.8 with adjacent-network attack vector, low complexity, no privileges, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where the named NETGEAR routers or gateways remain in service on firmware below the versions listed in the CVE description. The CVE metadata does not provide CPEs or deployment prevalence, so inventory confirmation is required.
Exploitation context
The source bundle says exploitation requires no authentication and no user interaction, but the CVSS vector is adjacent network, not internet-wide remote. CISA KEV is false in the provided data, and no cited source establishes active exploitation.
Researcher notes
The bundle does not include CWE, endpoint details, proof-of-concept status, or exploit telemetry. Avoid assuming internet-reachable exploitation because the CVSS vector is adjacent network. Research should focus on asset identification, firmware verification, and vendor advisory correlation.
Mitigation direction
- Inventory the named NETGEAR models and record current firmware versions.
- Upgrade affected devices to NETGEAR firmware versions at or above the listed fixed versions.
- Review the NETGEAR advisory for model-specific remediation guidance.
- Retire unsupported or unpatchable affected devices from production networks.
- Limit device management exposure according to vendor guidance and local policy.
Validation and detection
- Compare each device model and firmware version with the CVE affected-version list.
- Confirm firmware is at or above the fixed version named for that model.
- Check asset inventories for D3600, D6000, D7800, R6100, R7500, R9000, WNDR, and WNR2000v5 devices.
- Document any devices that cannot be patched and track compensating controls.
- Verify the remediation record references the NETGEAR advisory PSV-2017-2458.
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-2018-21222 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/000055115/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-and-Gateways-PSV-2017-2458CVE 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.