Security readout for executives and security teams
Plain-English summary
CVE-2018-21182 is a post-authentication stack overflow in specific NETGEAR routers. An attacker would need authenticated access and adjacent-network reach, but successful exploitation could seriously affect confidentiality, integrity, and availability. The main business risk is unmanaged legacy routers running older firmware.
Executive priority
Handle through normal vulnerability remediation with priority for exposed or business-critical network locations. Escalate if vulnerable routers administer sensitive sites, have broad internal reachability, or cannot be updated promptly.
Technical view
The CVE describes a stack-based buffer overflow reachable by an authenticated user. Affected versions are R7800 before 1.0.2.40, R9000 before 1.0.2.52, WNDR3700v4 before 1.0.2.92, and WNDR4300 before 1.0.2.94. CVSS 3.0 is 6.8 with adjacent-network access and high privileges required.
Likely exposure
Exposure is likely limited to environments still using the named NETGEAR router models on vulnerable firmware. Risk is higher where router administration is shared, weakly controlled, or reachable from broad internal networks. The provided sources do not identify other affected products.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The vulnerability is post-authentication and adjacent-network scoped, so it is less exposed than an unauthenticated internet-facing flaw, but impact is high if an attacker already has valid privileged access.
Researcher notes
The provided data names affected model/version thresholds but does not include CWE mapping, root-cause detail, proof-of-concept status, or exploitation evidence. Avoid expanding scope beyond the four models unless vendor or CVE sources add more detail.
Mitigation direction
- Inventory the named NETGEAR router models and firmware versions.
- Update R7800, R9000, WNDR3700v4, and WNDR4300 to fixed or later firmware.
- Restrict router administration access to trusted management networks only.
- Review vendor advisory guidance before applying operational changes.
- Replace unsupported or unmanageable legacy routers.
Validation and detection
- Confirm whether any deployed router matches the four named models.
- Compare firmware against the vulnerable version thresholds in the advisory.
- Verify router admin interfaces are not broadly reachable from user networks.
- Review privileged router accounts for shared, stale, or unnecessary access.
- Check vendor advisory status for model-specific firmware availability.
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-2018-21182 mapping review
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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/000055176/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-PSV-2017-2617CVE 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.