CVE-2021-29295
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 · uneditedNull Pointer Dereference vulnerability exists in D-Link DSP-W215 1.10, which could let a remote malicious user cause a denial of servie via usr/bin/lighttpd. It could be triggered by sending an HTTP request without URL in the start line directly to the device. NOTE: The DSP-W215 and all hardware revisions is considered End of Life and as such this issue will not be patched
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 · high confidenceA null pointer dereference vulnerability exists in the lighttpd web server (usr/bin/lighttpd) on D-Link DSP-W215 devices version 1.10. The vulnerability can be triggered by sending a specially crafted HTTP request that lacks a URL in the request line, causing the web server to crash and result in a denial of service.
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 data= 1.10CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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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Confirm device modelCheck the physical device label or login to the device admin interface to verify the model number is D-Link DSP-W215Affected if Device model is not D-Link DSP-W215 - not affected
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Check firmware versionAccess the device admin web interface, typically at 192.168.0.1, and navigate to the firmware or status page to determine the installed firmware versionAffected if Firmware version is not 1.10 - not affected
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Identify web server binaryUse SSH or telnet to access the device shell and run 'ps' or check /proc to identify if lighttpd (usr/bin/lighttpd) is running as the web server processAffected if lighttpd is not running as the web server - not affected
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Verify web service accessibilityAttempt to access the device web interface over HTTP on the standard port (80) to confirm the lighttpd service is actively listeningAffected if Web service is not accessible or not running - not affected
The environment is affected only if the device is a D-Link DSP-W215 running firmware version 1.10 with the lighttpd web server actively running and accessible.
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.
dbcve · scopedSince this device is End of Life and will not receive a firmware patch, implement network-level controls (firewall/IPS rules) to block malformed HTTP requests, or replace the affected device with a supported model.
- This vulnerability will not be patched as the D-Link DSP-W215 is End of Life (EOL).
- Replace the EOL DSP-W215 device with a currently supported model from D-Link or another vendor.
- If immediate replacement is not possible, place the device behind a firewall and restrict network access to trusted users only to minimize exposure to remote attacks.
- Monitor vendor announcements for any future security updates (though none are currently planned for this EOL product).
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-29295 — 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-2021-29295 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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