CVE-2021-20637
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 · uneditedImproper check or handling of exceptional conditions in LOGITEC LAN-W300N/PR5B allows a remote attacker to cause a denial-of-service (DoS) condition by sending a specially crafted URL.
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 confidenceImproper exception handling in the LOGITEC LAN-W300N/PR5B wireless access point allows a remote attacker to cause a denial-of-service condition by sending a specially crafted URL to the device's web interface. The vulnerability stems from inadequate input validation or error handling when processing certain URL requests, leading to a service crash or unavailability.
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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 modelCheck the device label, management interface, or network discovery for the exact model number LOGITEC LAN-W300N/PR5B. This can be done via SNMP, network scanning, or physical inspection of the device.Affected if The device is a LOGITEC LAN-W300N or PR5B model wireless access point
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Confirm firmware versionAccess the device's web management interface and navigate to the status or system information page to display the current firmware version.Affected if Any firmware version is installed (all versions are affected)
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Verify web interface is accessibleAttempt to reach the device's web interface via HTTP/HTTPS on the management IP address. Check if ports 80 or 443 (or custom web ports) respond to requests.Affected if The web management interface is reachable on the network
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Check network exposureReview firewall rules, ACLs, or network segmentation to determine if the device's management interface is exposed to untrusted networks or the public internet.Affected if The management interface is accessible from networks outside the trusted administrative zone
If the device is a LOGITEC LAN-W300N/PR5B with its web interface accessible to the network, the environment is affected by this 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 dataApply the vendor-supplied firmware update for LOGITEC LAN-W300N/PR5B. If no patch is available, restrict network access to the device's management interface using firewall rules or network segmentation to prevent unauthorized attackers from sending malicious requests.
- Consultation4.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-20637 — 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-2021-20637 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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