Security readout for executives and security teams
Plain-English summary
This issue affects NETGEAR R7800 routers running firmware before 1.0.2.60. An already authenticated user on an adjacent network path could trigger command injection. The potential device impact is high, but required privileges and adjacent access reduce broad internet risk.
Executive priority
Treat as a moderate-priority network device issue. Prioritize firmware updates where R7800 routers protect sensitive networks, are remotely administered, or have weak admin account governance.
Technical view
CVE-2018-21108 is a post-authentication command injection 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 reachability, low complexity, high privileges required, no user interaction, unchanged scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to NETGEAR R7800 devices below firmware 1.0.2.60, especially where router administration is reachable by privileged users on local or adjacent networks. The source bundle does not identify other affected NETGEAR models.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. The vulnerability is post-authentication and requires high privileges, so realistic risk depends on admin credential control, management interface exposure, and whether affected firmware remains deployed.
Researcher notes
The affected product detail is narrow in the bundle: NETGEAR R7800 before 1.0.2.60. No CWE, exploit narrative, proof-of-concept, or broader affected CPE data is provided, so validation should focus on version confirmation and management-plane exposure.
Mitigation direction
- Upgrade NETGEAR R7800 firmware to 1.0.2.60 or later.
- Review NETGEAR advisory guidance before making production changes.
- Restrict router administration to trusted management networks.
- Limit and audit privileged router administrator accounts.
- Rotate admin credentials if unauthorized access is suspected.
Validation and detection
- Inventory NETGEAR R7800 devices in use.
- Check each device firmware version against 1.0.2.60.
- Confirm router administration is not broadly reachable.
- Review administrator account list and recent access history.
- Document remediation status for vulnerable devices.
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-2018-21108 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/000060443/Security-Advisory-for-a-Post-Authentication-Command-Injection-on-R7800-PSV-2018-0357CVE 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.