Security readout for executives and security teams
Plain-English summary
CVE-2018-21103 is a command injection issue in NETGEAR R7800 routers running firmware before 1.0.2.60. An already-authenticated user could potentially run commands on the device. Business urgency is moderate because attacker privileges are required, but router compromise can affect confidentiality, integrity, and availability.
Executive priority
Prioritize remediation for R7800 routers in business-critical, remote-office, or sensitive network segments. This is not presented as actively exploited, but router compromise can enable serious operational disruption or traffic exposure.
Technical view
The CVE describes post-authentication command injection on NETGEAR R7800 devices before firmware 1.0.2.60. CVSS 3.0 score is 6.8 with adjacent-network attack vector, low complexity, high privileges required, no user interaction, unchanged scope, and high CIA impact.
Likely exposure
Exposure is limited to NETGEAR R7800 devices running firmware earlier than 1.0.2.60, especially where router administration is reachable by authenticated local or adjacent-network users. No other affected products are named in the provided sources.
Exploitation context
The source bundle does not show CISA KEV listing or public evidence of active exploitation. The issue requires an authenticated user with high privileges and adjacent-network access, reducing broad internet-scale risk but leaving insider, stolen-admin, and poorly segmented network scenarios relevant.
Researcher notes
Evidence is sparse: the CVE record and NETGEAR advisory identify the product, version boundary, and post-authentication command injection class. No CWE, exploit details, or broader product list are provided in the bundle. Avoid assuming exploit availability or unauthenticated reachability.
Mitigation direction
- Upgrade NETGEAR R7800 firmware to 1.0.2.60 or later.
- Review NETGEAR’s advisory for any updated vendor instructions.
- Restrict router administration to trusted management networks.
- Remove unnecessary administrative accounts and rotate router admin credentials.
- Monitor for unexpected router configuration or firmware changes.
Validation and detection
- Inventory NETGEAR R7800 devices in all managed environments.
- Record each device firmware version.
- Flag any R7800 running firmware earlier than 1.0.2.60.
- Confirm management interfaces are not broadly reachable.
- Review administrative access history for unusual activity.
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-2018-21103 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/000060448/Security-Advisory-for-a-Post-Authentication-Command-Injection-on-R7800-PSV-2018-0363CVE 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.