CVE-2024-4236
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 · uneditedA vulnerability, which was classified as critical, has been found in Tenda AX1803 1.0.0.1. This issue affects the function formSetSysToolDDNS of the file /goform/SetDDNSCfg. The manipulation of the argument serverName/ddnsUser/ddnsPwd/ddnsDomain leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-262127. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
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 confidenceStack-based buffer overflow in Tenda AX1803 router firmware 1.0.0.1 allows remote attackers to overflow buffers via DDNS configuration parameters (serverName, ddnsUser, ddnsPwd, ddnsDomain) in the /goform/SetDDNSCfg formSetSysToolDDNS function. The high CVSS score reflects remote exploitability with potential for complete device compromise.
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= 1.0.0.1CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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.
-
Identify router modelAccess router web interface or check device label to confirm model is Tenda AX1803Affected if Device is not a Tenda AX1803 router - this vulnerability only affects that specific model
-
Check firmware versionLog into router web interface, navigate to System Settings or Firmware Upgrade page to view installed firmware version; or use telnet/SSH and run 'cat /proc/version' or 'ver' commandAffected if Firmware version is exactly 1.0.0.1 - only this version is listed as affected
-
Verify DDNS is configuredLog into router web interface, go to Advanced Settings or System Tools > DDNS section; check if any DDNS provider (such as DynDNS, No-IP, or Tenda's own DDNS) is enabled and configured with a server name, username, password, or domainAffected if DDNS is enabled and any of these fields are populated: serverName, ddnsUser, ddnsPwd, or ddnsDomain - the overflow occurs when processing these parameters
-
Inspect DDNS form submissionIf DDNS is enabled, examine the /goform/SetDDNSCfg HTTP POST request (using browser dev tools or a proxy) and check if the submitted parameters contain unusually long strings that could indicate exploitation attemptsAffected if DDNS parameters contain data exceeding typical length limits (e.g., serverName or ddnsDomain with more than 256 characters) - this may indicate active exploitation
User is affected if they have a Tenda AX1803 router running firmware version 1.0.0.1 with DDNS functionality enabled and configured.
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 dataIf vendor firmware update unavailable, disable DDNS functionality, restrict access to the router's web management interface via ACLs or VPN, and consider network segmentation; end-of-life devices should be replaced.
- Consultation6.0 h
- Implementation8.0 h
- Testing5.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,288.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-4236 — 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-2024-4236 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