CVE-2006-7121
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 · uneditedThe HTTP server in Linksys SPA-921 VoIP Desktop Phone allows remote attackers to cause a denial of service (reboot) via (1) a long URL, or a long (2) username or (3) password during Basic Authentication.
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 confidenceThe HTTP server in the Linksys SPA-921 VoIP Desktop Phone contains a buffer overflow vulnerability when handling Basic Authentication credentials. By sending HTTP requests with excessively long URLs, usernames, or passwords, an attacker can trigger a buffer overflow causing the device to reboot, resulting in 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= 1.0.0CVSS 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
- Authentication
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- Complete
AV:N/AC:L/Au:N/C:N/I:N/A:C
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.
-
Identify the device modelAccess the device's web interface or check the physical device label to confirm it is a Linksys SPA-921 VoIP Desktop PhoneAffected if The device is not a Linksys SPA-921 model
-
Check the firmware versionLocate the firmware version in the device's web admin interface (typically under Settings > Firmware or a similar administration page), or check via the device's web interface or SIP options pageAffected if The firmware version is 1.0.0 (exact match)
-
Verify the HTTP server is enabledConfirm that the embedded HTTP server is active on the device - this is typically enabled by default for web-based administration on VoIP phonesAffected if The HTTP server feature is disabled or not accessible
-
Confirm network accessibility of the HTTP serviceAttempt to reach the device's web interface over the network using a browser or curl/wget to verify the HTTP service is reachableAffected if The HTTP service is not network-accessible (isolated internally)
-
Assess the attack surfaceDetermine whether the device is exposed to untrusted networks or the internet, or if it is isolated on an internal network segmentAffected if The device is directly exposed to untrusted networks without network segmentation
A user is affected if they have a Linksys SPA-921 phone running firmware version 1.0.0 with the HTTP server enabled and accessible on a network where untrusted parties can send HTTP requests.
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 dataIsolate the affected device on a restricted network segment to limit attack surface; if the device is still in production, strongly consider replacement with a supported model since this is a 2006-era end-of-life product with no documented vendor patch.
- Consultation4.0 h
- Testing2.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,336.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2006-7121 — 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-2006-7121 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data