Security readout for executives and security teams
Plain-English summary
A NETGEAR R7800 router running firmware earlier than 1.0.2.60 could let an already authenticated user inject operating-system commands. The attacker must have high privileges and adjacent network access, but successful exploitation could compromise router confidentiality, integrity, and availability.
Executive priority
Treat this as a targeted infrastructure hardening item, not an emergency internet-wide crisis. Prioritize if R7800 routers remain in production or administration is exposed beyond tightly controlled staff networks.
Technical view
CVE-2018-21105 is a post-authentication command injection issue affecting NETGEAR R7800 devices before firmware 1.0.2.60. CVSS 3.0 is 6.8, with adjacent-network attack vector, low complexity, high privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to organizations still operating NETGEAR R7800 routers below firmware 1.0.2.60, especially where administrator access is shared, weakly controlled, or reachable from untrusted adjacent networks.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The flaw requires authentication with high privileges, reducing broad internet-scale risk but increasing concern for insider, reused-credential, or compromised-admin scenarios.
Researcher notes
The bundle names the affected model and fixed threshold but provides no CWE, CPE, exploit narrative, or detailed vulnerable parameter. Avoid assuming broader NETGEAR impact without vendor confirmation.
Mitigation direction
- Upgrade NETGEAR R7800 firmware to 1.0.2.60 or later if supported.
- Review NETGEAR’s advisory for current vendor guidance and replacement options.
- Restrict router administration to trusted management networks only.
- Remove unnecessary administrator accounts and rotate shared administrative credentials.
- Monitor router configuration changes and unexpected reboots.
Validation and detection
- Inventory NETGEAR R7800 routers and record firmware versions.
- Confirm no R7800 device is running firmware earlier than 1.0.2.60.
- Verify administrative access is not reachable from guest or untrusted networks.
- Review administrator accounts for stale, shared, or unnecessary access.
- Check logs for suspicious authenticated configuration 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-2018-21105 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/000060446/Security-Advisory-for-a-Post-Authentication-Command-Injection-on-R7800-PSV-2018-0361CVE 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.