Security readout for executives and security teams
Plain-English summary
Some older NETGEAR routers and gateways have a memory-handling flaw reachable after login. It matters most where attackers can obtain administrator-level access on the same or adjacent network. The sources do not show known active exploitation, but vulnerable network edge devices should still be updated or retired.
Executive priority
Treat as a medium-priority infrastructure hygiene issue. Prioritize internet-edge or business-critical locations first, especially where legacy NETGEAR devices remain in service or admin access is loosely controlled.
Technical view
CVE-2018-21188 is a post-authentication stack-based buffer overflow in certain NETGEAR devices. The CVSS 3.0 vector is 6.8, with adjacent-network attack vector, low complexity, high privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to listed NETGEAR models running firmware older than the fixed versions: D7800, R7500v2, R7800, R9000, WNDR3700v4, WNDR4300, WNDR4300v2, WNDR4500v3, and WNR2000v5.
Exploitation context
The bundle identifies this as authenticated and not in CISA KEV. No provided source states active exploitation. Risk increases if admin credentials are weak, shared, reused, or reachable from untrusted adjacent networks.
Researcher notes
The affected product metadata in the bundle is generic, but the CVE description provides specific models and firmware thresholds. No CWE is supplied. Do not assume unauthenticated or remote internet exploitation from these sources.
Mitigation direction
- Upgrade affected devices to the fixed firmware versions named by NETGEAR or later.
- Check the NETGEAR advisory for model-specific firmware and support status.
- Restrict device administration to trusted management networks and authorized administrators.
- Remove or replace devices that cannot receive supported firmware updates.
Validation and detection
- Inventory NETGEAR router and gateway models against the affected model list.
- Compare installed firmware with the fixed versions in the CVE description.
- Confirm administrative access is restricted to trusted networks and users.
- Review whether any affected devices are unsupported or unmanaged.
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-2018-21188 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
- Medium
- CVSS
- 6.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:H/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:H/S:U/UI:N0.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.8MediumVector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:H/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000055169/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-and-Gateways-PSV-2017-2607CVE 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.