Security readout for executives and security teams
Plain-English summary
This vulnerability affects specific NETGEAR routers, gateways, and extenders running older firmware. An already authenticated user could trigger a stack-based buffer overflow. Impact ratings are high for confidentiality, integrity, and availability, but the need for high privileges and adjacent-network access reduces broad internet urgency.
Executive priority
Prioritize remediation where affected devices protect business networks, remote offices, or sensitive environments. This is not evidenced as actively exploited, but the potential impact is high if an authenticated attacker reaches device administration.
Technical view
CVE-2018-21181 is a post-authentication stack-based buffer overflow in listed NETGEAR devices. CVSS v3.0 vector AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H gives a 6.8 score. Affected versions are firmware releases before NETGEAR's named fixed versions across D7800, EX, R, WN, WNDR, and WNR models.
Likely exposure
Exposure is most likely in small office, branch, home-office, or unmanaged network environments still running the named NETGEAR models on older firmware. The issue requires authenticated access, so shared, weak, or compromised administrator credentials materially increase risk.
Exploitation context
The provided bundle does not show CISA KEV listing or active exploitation. Exploitation is described as adjacent-network, low complexity, no user interaction, and high privileges required. Treat it primarily as a risk from compromised administrators, insiders, or poorly controlled management access.
Researcher notes
The source data lacks CWE mapping, detailed vulnerable function information, proof-of-concept status, and vendor mitigation beyond fixed firmware versions. Do not infer affected products outside the explicitly listed NETGEAR models and firmware thresholds.
Mitigation direction
- Inventory the specific NETGEAR models named in the advisory.
- Upgrade affected devices to at least the fixed firmware version listed by NETGEAR.
- Restrict administrative access to trusted management networks only.
- Review administrator accounts and rotate weak or shared credentials.
- Replace devices that cannot receive the fixed firmware.
Validation and detection
- Confirm each device model and firmware version from the management interface or asset inventory.
- Compare firmware against the fixed versions in the NETGEAR advisory.
- Verify management interfaces are not reachable from untrusted network segments.
- Check for unexpected administrator accounts or recent configuration changes.
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-2018-21181 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/000055177/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-Gateways-and-Extenders-PSV-2017-2618CVE 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.