Security readout for executives and security teams
Plain-English summary
CVE-2018-21127 is a high-severity pre-authentication command injection issue in certain NETGEAR wireless access points. An attacker who can reach the vulnerable device on the adjacent network could potentially run commands without logging in, creating serious confidentiality, integrity, and availability risk.
Executive priority
Treat this as a priority infrastructure remediation item, especially for access points in sensitive offices or shared network environments. It is not confirmed as actively exploited in the provided sources, but unauthenticated command execution on network equipment warrants prompt action.
Technical view
The CVE affects NETGEAR WAC505 and WAC510 devices running firmware before 5.0.0.17. The CVSS 3.0 score is 8.8 with adjacent-network access, low complexity, no privileges, no user interaction, and high impact to confidentiality, integrity, and availability.
Likely exposure
Exposure is limited to NETGEAR WAC505 and WAC510 wireless access points on firmware before 5.0.0.17. The CVSS vector indicates adjacent-network attack scope, so prioritize devices reachable from wireless, management, or local network segments.
Exploitation context
The provided bundle does not show CISA KEV listing or other cited evidence of active exploitation. The vulnerability is still operationally important because it is unauthenticated, low-complexity, and affects infrastructure devices that may bridge trusted networks.
Researcher notes
The source data names only WAC505 and WAC510 before 5.0.0.17. Do not generalize to other NETGEAR products without vendor evidence. The adjacent-network vector is important when scoping reachability and compensating controls.
Mitigation direction
- Identify WAC505 and WAC510 devices in all offices and remote sites.
- Check installed firmware and flag versions before 5.0.0.17.
- Apply NETGEAR vendor firmware guidance for affected devices.
- Restrict management access to trusted administrative networks.
- Retire unsupported or unpatchable affected access points.
Validation and detection
- Confirm device model and firmware from inventory or management console.
- Verify no WAC505 or WAC510 remains below firmware 5.0.0.17.
- Review network access paths to vulnerable access point interfaces.
- Check logs for unusual administrative activity where available.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-21127 mapping review
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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/000060231/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Wireless-Access-Points-PSV-2018-0263CVE 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.