Security readout for executives and security teams
Plain-English summary
CVE-2018-14839 is a critical remote command execution flaw in LG N1A1 NAS firmware 3718.510. An unauthenticated network attacker can submit crafted HTTP POST parameters and run arbitrary commands on the device. CISA lists it in KEV, so treat reachable devices as urgent exposure.
Executive priority
Prioritize this as an emergency remediation item for any exposed LG N1A1 NAS device. The weakness enables full remote compromise without authentication, and CISA KEV indicates real-world exploitation. If patch status cannot be confirmed, isolate or retire the device.
Technical view
The CVE describes CWE-78 command injection reachable over the network with low complexity, no privileges, and no user interaction. CVSS 3.1 is 9.8, with high confidentiality, integrity, and availability impact. Public details identify unauthenticated remote command injection in LG N1A1 NAS 3718.510.
Likely exposure
Exposure is most likely where LG N1A1 NAS devices run firmware 3718.510 and expose their HTTP interface to untrusted networks. The source bundle does not provide CPEs or complete affected-version metadata, so inventory validation is required.
Exploitation context
Active exploitation is supported by CISA KEV listing for CVE-2018-14839. The public vulnerability description indicates exploitation occurs through HTTP POST parameters. No exploit steps, payloads, or weaponization details are needed to assess business urgency.
Researcher notes
Evidence is strong for critical unauthenticated command injection and KEV status. Evidence is incomplete for vendor-supported fixes, exact CPE mapping, and all affected versions beyond LG N1A1 NAS 3718.510. Avoid assuming coverage for other LG NAS models without source confirmation.
Mitigation direction
- Identify LG N1A1 NAS devices and confirm firmware versions.
- Remove exposed NAS HTTP interfaces from the internet immediately.
- Check LG or vendor guidance for fixed firmware or retirement direction.
- Restrict management access to trusted networks or VPN only.
- Segment affected NAS devices from sensitive systems.
- Replace unsupported devices if no vendor remediation is available.
Validation and detection
- Search asset inventory for LG N1A1 NAS devices.
- Confirm whether firmware version 3718.510 is present.
- Review firewall and external exposure data for reachable HTTP services.
- Check logs for suspicious HTTP POST activity and command execution indicators.
- Verify CISA KEV status is tracked in remediation workflows.
- Confirm compensating controls block untrusted network access.
Public sources used
Michael Williams reviewed this cited source version on .
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.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution 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-2018-14839 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
CISA KEV status
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://medium.com/%400x616163/lg-n1a1-unauthenticated-remote-command-injection-cve-2018-14839-9d2cf760e247CVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-14839CVE reference · government-resource
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.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.