CVE-2024-5243
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 · uneditedTP-Link Omada ER605 Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link Omada ER605 routers. Authentication is not required to exploit this vulnerability. However, devices are vulnerable only if configured to use the Comexe DDNS service. The specific flaw exists within the handling of DNS names. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-22523.
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 buffer overflow vulnerability exists in TP-Link Omada ER605 routers in the DNS name handling component. The flaw results from insufficient validation of user-supplied data length before copying to a fixed-size buffer. Attackers with network adjacency can exploit this without authentication (when Comexe DDNS is enabled) to achieve root-level code execution.
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= 2.2.2CVSS 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
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/AC:H/PR:N/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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Confirm device model is TP-Link Omada ER605Access the router web interface and check the Device Info page, or use the Omada Controller software to verify the device model. Alternatively, check the label on the device physical unit.Affected if Device is not an ER605 model (different models have different vulnerability status)
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Check firmware version is 2.2.2In the router web interface, go to System > Firmware Upgrade or Status page to view the installed firmware version. Compare this to the affected version 2.2.2.Affected if Firmware version equals exactly 2.2.2 (this is the only version listed as affected)
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Verify Comexe DDNS service statusIn the router web interface, navigate to Advanced > DDNS or Network Services > Comexe DDNS. Check whether the Comexe DDNS service is enabled or disabled.Affected if Comexe DDNS is currently enabled - this is required for unauthenticated exploitation via network adjacency
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Check network exposure of the routerDetermine if the router management interface is accessible from untrusted networks. Verify whether the router is directly exposed to the internet or on a shared network segment where untrusted users have adjacency.Affected if Router is accessible from network segments where untrusted attackers have adjacency (required for exploit delivery)
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Check for unauthorized DNS configuration changesReview the DDNS and DNS settings in the router configuration. Look for any unexpected DNS server entries or DDNS provider configurations that may indicate exploitation attempts.Affected if DNS settings have been modified without administrator action, indicating potential compromise attempt
User is affected if the device is an ER605 running firmware version 2.2.2 with Comexe DDNS enabled and accessible to untrusted network adjacency.
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 dataDisable the Comexe DDNS service on affected devices as an immediate workaround. Monitor TP-Link for official firmware updates addressing this vulnerability and apply them promptly once available.
- Consultation4.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2024-5243 — 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-2024-5243 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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