Security readout for executives and security teams
Plain-English summary
A NETGEAR R7800 router running firmware before 1.0.2.60 can let a logged-in user inject operating-system commands. This is high-risk because a compromised or low-privilege admin session could affect router integrity and availability. The provided sources do not show active exploitation.
Executive priority
Prioritize remediation for any R7800 used in business networks, especially where router administration is broadly reachable. The issue can affect network device control and availability after authentication, so it should be handled in the next normal security maintenance window or sooner for exposed management interfaces.
Technical view
CVE-2018-21100 is a post-authentication command injection issue in NETGEAR R7800 firmware before 1.0.2.60. CVSS 3.0 is 7.6 with low attack complexity, adjacent-network attack vector, low privileges required, no user interaction, high integrity and availability impact, and low confidentiality impact.
Likely exposure
Exposure is limited to NETGEAR R7800 devices on firmware earlier than 1.0.2.60 where an attacker can authenticate and reach the device management surface from an adjacent network. Public-facing administration would increase urgency, but the provided sources do not state internet exposure requirements.
Exploitation context
The vulnerability requires authentication and adjacent-network access according to the CVSS vector. The source bundle marks KEV as false, and no cited source confirms active exploitation. Treat exploit status as unconfirmed, not absent.
Researcher notes
The public record is sparse: no CWE is listed, affected CPE data is unavailable in the bundle, and exploitation is not confirmed. Validation should focus on firmware version, management-plane exposure, and whether authentication boundaries are strong enough to prevent low-privilege or stolen-credential misuse.
Mitigation direction
- Update NETGEAR R7800 firmware to version 1.0.2.60 or later.
- Review NETGEAR advisory guidance before applying operational changes.
- Restrict router administration to trusted management networks only.
- Disable unnecessary remote administration exposure if enabled.
- Rotate router administrator credentials after patching if compromise is suspected.
Validation and detection
- Inventory NETGEAR R7800 devices and record current firmware versions.
- Confirm each affected device runs firmware 1.0.2.60 or later.
- Verify management interfaces are reachable only from trusted networks.
- Review router admin logs for unexpected authenticated changes.
- Track the NETGEAR advisory for any updated remediation details.
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-2018-21100 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/000060450/Security-Advisory-for-Post-Authentication-Command-Injection-on-R7800-PSV-2018-0382CVE 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.