Security readout for executives and security teams
Plain-English summary
CVE-2018-21099 affects NETGEAR R7800 routers running firmware before 1.0.2.60. An authenticated user could inject operating-system commands, potentially changing device behavior or disrupting availability. This is most urgent where router access is shared, weakly controlled, or exposed to untrusted local users.
Executive priority
Treat this as a high-priority router maintenance issue. Patch affected R7800 devices promptly, especially in offices, labs, or shared networks where authenticated access may not be tightly controlled.
Technical view
The record describes a post-authentication command injection in NETGEAR R7800 before firmware 1.0.2.60. CVSS 3.0 is 7.6 with adjacent attack vector, low privileges, no user interaction, high integrity impact, high availability impact, and low confidentiality impact.
Likely exposure
Exposure is limited to NETGEAR R7800 devices running firmware earlier than 1.0.2.60, where an attacker can authenticate and reach the device over an adjacent network path.
Exploitation context
The provided sources do not state active exploitation, and this CVE is not marked KEV. Risk still matters because successful abuse could let an authenticated local attacker execute commands on a network gateway device.
Researcher notes
Evidence is sparse: the CVE description and NETGEAR advisory identify post-authentication command injection and the fixed firmware boundary. No CWE, detailed vulnerable endpoint, exploit details, or confirmed exploitation evidence is provided in the source bundle.
Mitigation direction
- Upgrade NETGEAR R7800 firmware to 1.0.2.60 or later.
- Review the NETGEAR advisory for any model-specific instructions.
- Restrict router authentication to trusted users only.
- Limit management access to trusted local networks.
- Remove unused accounts and enforce strong router credentials.
Validation and detection
- Inventory all NETGEAR R7800 devices in managed environments.
- Check each device firmware version against 1.0.2.60.
- Confirm management access is not available to untrusted users.
- Review device configuration for unnecessary accounts.
- Check logs for unexpected configuration or availability events.
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
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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-2018-21099 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.6 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/A:H/C:L/I:H/PR:L/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:L/I:H/PR:L/S:U/UI:N2.15.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.6HighVector: CVSS:3.0/AC:L/AV:A/A:H/C:L/I:H/PR:L/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000060451/Security-Advisory-for-Post-Authentication-Command-Injection-on-R7800-PSV-2018-0384CVE 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.