Security readout for executives and security teams
Plain-English summary
CVE-2018-21143 affects NETGEAR GS810EMX switches running firmware before 1.0.0.5. The issue can expose sensitive information to an unauthenticated attacker on an adjacent network. Business impact is mainly confidentiality loss, not device takeover or service outage based on the provided sources.
Executive priority
Treat this as a moderate-priority network device remediation. It is not reported as actively exploited in the provided sources, but vulnerable switches can leak sensitive information without authentication from nearby networks.
Technical view
The CVSS 3.0 vector is AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. This indicates adjacent-network reachability, low complexity, no privileges, no user interaction, high confidentiality impact, and no stated integrity or availability impact. Sources do not provide CWE details, CPEs, or vulnerability mechanics.
Likely exposure
Exposure is likely limited to environments with NETGEAR GS810EMX devices below firmware 1.0.0.5 reachable from an adjacent network. The bundle does not indicate internet-scale exposure or affected products beyond GS810EMX.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector still indicates practical risk from a nearby unauthenticated network position, with sensitive information disclosure as the documented impact.
Researcher notes
Evidence is sparse. The CVE record and NETGEAR advisory identify GS810EMX before 1.0.0.5 and a sensitive information disclosure condition, but do not include CWE, CPEs, affected configurations, or technical root cause in the bundle.
Mitigation direction
- Identify all NETGEAR GS810EMX devices in the environment.
- Upgrade GS810EMX firmware to 1.0.0.5 or a later NETGEAR-supported release.
- Restrict management access to trusted administration networks.
- Check NETGEAR guidance for any model-specific update instructions.
Validation and detection
- Confirm each GS810EMX firmware version is 1.0.0.5 or later.
- Verify management interfaces are not reachable from untrusted adjacent networks.
- Review asset inventory for overlooked GS810EMX devices.
- Document any remaining devices awaiting vendor-supported remediation.
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
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CVE-2018-21143 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/A:N/C:H/I:N/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:N/C:H/I:N/PR:N/S:U/UI:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.5MediumVector: CVSS:3.0/AC:L/AV:A/A:N/C:H/I:N/PR:N/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000059490/Security-Advisory-for-Sensitive-Information-Disclosure-on-GS810EMX-PSV-2018-0220CVE 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.