Security readout for executives and security teams
Plain-English summary
This flaw affects several older NETGEAR routers, gateways, and extenders. An unauthenticated nearby network attacker could trigger a buffer overflow with potentially severe impact to device confidentiality, integrity, and availability. The business risk is highest where these devices remain in office, branch, or remote-work networks on outdated firmware.
Executive priority
Prioritize remediation where affected devices support business, guest, branch, or remote-access networks. Treat this as a high-priority network appliance hygiene issue, especially for unmanaged or forgotten devices.
Technical view
CVE-2018-21210 is a pre-authentication buffer overflow affecting listed NETGEAR models before specified firmware versions. The CVSS 3.0 score is 8.8, with low attack complexity, no privileges, no user interaction, adjacent-network attack vector, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to the listed NETGEAR models running firmware earlier than the fixed versions in the CVE description. Organizations may miss these devices because they often sit outside standard server and endpoint inventories.
Exploitation context
The source bundle does not show active exploitation, and KEV is false. The CVSS vector indicates adjacent-network reach, not proven internet-wide exploitation. Evidence is sufficient for high severity, but incomplete for real-world exploitation status.
Researcher notes
Key constraints are the adjacent-network CVSS vector and lack of source evidence for exploitation. Validation should focus on exact model and firmware matching. Do not generalize this CVE to unlisted NETGEAR products without vendor evidence.
Mitigation direction
- Inventory the listed NETGEAR models and current firmware versions.
- Upgrade affected devices to the fixed versions named in the CVE or later vendor firmware.
- If updates are unavailable, replace the device or remove it from sensitive networks.
- Restrict access to device management interfaces to trusted administrative networks.
- Check NETGEAR advisory guidance before applying operational changes.
Validation and detection
- Compare device model and firmware against the affected version list.
- Confirm updated firmware persists after reboot and reports the expected version.
- Review network inventory for unmanaged routers, extenders, and gateways.
- Verify management interfaces are not reachable from untrusted network segments.
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-2018-21210 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/000055139/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-Gateways-and-Extenders-PSV-2017-2492CVE 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.