Security readout for executives and security teams
Plain-English summary
CVE-2021-38521 is a command injection flaw in specific NETGEAR router firmware. A user who is already authenticated could cause the device to run unintended commands. That matters because routers sit at a sensitive network boundary, but the source evidence indicates high privileges, local access, and user interaction are required.
Executive priority
Prioritize as a moderate router hygiene issue. It is not KEV-listed in the provided evidence, but successful abuse could undermine a network boundary device. Patch affected routers during the next controlled maintenance window, sooner for high-value or shared-admin environments.
Technical view
The CVE describes post-authentication command injection affecting NETGEAR R6400, R7900P, R8000P, RAX75, and RAX80 firmware before specified fixed versions. CVSS 3.1 is 6.1 with local attack vector, low complexity, high privileges required, user interaction required, and high confidentiality/integrity impact.
Likely exposure
Exposure is limited to organizations using the listed NETGEAR models on vulnerable firmware: R6400 before 1.0.1.50, R7900P/R8000P before 1.4.1.50, and RAX75/RAX80 before 1.0.1.62.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. The CVSS vector indicates exploitation is not unauthenticated remote abuse; it requires local attack conditions, high privileges, and user interaction. Treat public exploit status as unconfirmed from the provided evidence.
Researcher notes
The affected-product metadata in the bundle is sparse, but the description names exact models and vulnerable version cutoffs. No CWE is provided. Do not infer broader NETGEAR exposure beyond the listed models without vendor confirmation.
Mitigation direction
- Inventory NETGEAR R6400, R7900P, R8000P, RAX75, and RAX80 devices.
- Upgrade affected firmware to the fixed versions listed by NETGEAR or later.
- Restrict router administration to trusted administrators and management networks.
- Review NETGEAR advisory guidance before applying any operational workaround.
- Replace unsupported devices if fixed firmware is unavailable.
Validation and detection
- Confirm exact router model and running firmware version.
- Compare firmware against the affected version thresholds in the CVE record.
- Verify administrative access is limited to approved users and networks.
- Review recent router admin activity for unexpected configuration changes.
- Record remediation status for each affected router asset.
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-2021-38521 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AC:L/AV:L/A:L/C:H/I:H/PR:H/S:U/UI:R
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:3.1/AC:L/AV:L/A:L/C:H/I:H/PR:H/S:U/UI:R0.65.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AC:L/AV:L/A:L/C:H/I:H/PR:H/S:U/UI:R
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000063764/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-Routers-PSV-2018-0566CVE reference · x_refsource_MISC
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.