CVE-2021-20639
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedLOGITEC LAN-W300N/PGRB allows an attacker with administrative privilege to execute arbitrary OS commands via unspecified vectors.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceLOGITEC LAN-W300N/PGRB wireless LAN adapter contains an OS command injection vulnerability. An attacker with administrative privileges can execute arbitrary operating system commands, likely through the device's web management interface or similar administrative function. This is a privilege escalation issue where the attacker needs admin access but can then break out of the application's context to run OS-level commands.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE dataall versionsCVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Adjacent
- Complexity
- Low
- Privileges
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the device modelInspect the physical wireless adapter or check network inventory for LOGITEC LAN-W300N/PGRB devicesAffected if The device is present in the environment - all firmware versions are affected
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Determine firmware versionAccess the device's web management interface and check the firmware version in the admin settings or system information pageAffected if Firmware version is any version - all versions are affected according to the CVE
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Verify web management interface accessibilityCheck if the device's web interface (typically HTTP on port 80/443) is exposed to the network using a port scan or network access list reviewAffected if The web management interface is reachable from untrusted network segments
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Assess admin access controlsReview who has administrative credentials for the device and whether default credentials are still in useAffected if Multiple users have admin access or default credentials remain unchanged, increasing exploitation likelihood
If the LOGITEC LAN-W300N/PGRB device is present in your environment, you are affected since all firmware versions contain the OS command injection vulnerability.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataRestrict administrative access to trusted users only and change default credentials. Since this is a hardware device with limited patching information, if no firmware update is available, consider network isolation or device replacement.
- Consultation8.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,304.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-20639 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-20639 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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