Security readout for executives and security teams
Plain-English summary
This issue affects NETGEAR R7800 routers running firmware before 1.0.2.60. A user who already has high-privilege authenticated access from an adjacent network could inject commands on the device. Business urgency is moderate because prerequisites are significant, but compromise could fully affect router confidentiality, integrity, and availability.
Executive priority
Treat this as a scheduled remediation item unless R7800 administration is widely accessible or credentials are weak. Prioritize faster action for branch, home-office, or exposed management environments.
Technical view
CVE-2018-21109 is a post-authentication command injection vulnerability in NETGEAR R7800 firmware before 1.0.2.60. The CVSS 3.0 vector is AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, indicating adjacent-network access, high privileges, no user interaction, and high impact to the device.
Likely exposure
Exposure is limited to NETGEAR R7800 devices on firmware older than 1.0.2.60, especially where administrative access is reachable from local or adjacent networks. The source bundle does not identify other affected products.
Exploitation context
The bundle does not show CISA KEV listing or other evidence of active exploitation. Exploitation requires an authenticated high-privilege user and adjacent-network access, but successful abuse could allow command execution on the router.
Researcher notes
Evidence is sparse: the CVE description and vendor reference identify product, version boundary, and vulnerability class, but not the vulnerable parameter, endpoint, proof of concept, or detailed patch notes. Avoid assuming broader NETGEAR impact.
Mitigation direction
- Upgrade NETGEAR R7800 firmware to 1.0.2.60 or later.
- Review the NETGEAR advisory for current vendor guidance.
- Restrict router administrative access to trusted management networks.
- Remove unnecessary administrative accounts and rotate router administrator credentials.
- Monitor for unexpected configuration changes or administrative logins.
Validation and detection
- Inventory all NETGEAR R7800 devices in the environment.
- Confirm each device firmware version is 1.0.2.60 or later.
- Verify router administration is not broadly reachable from untrusted local networks.
- Review router accounts for unnecessary privileged users.
- Check administrative logs for unexpected access before 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
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-2018-21109 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
- 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/000060442/Security-Advisory-for-a-Post-Authentication-Command-Injection-on-R7800-PSV-2018-0356CVE 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.