CVE-2024-6199
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 · uneditedAn unauthenticated attacker on the WAN interface, with the ability to intercept Dynamic DNS (DDNS) traffic between DDNS services and the modem, could manipulate specific responses to include code that forces a buffer overflow on the modem. Customers that have not enabled Dynamic DNS on their modem are not vulnerable.
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 confidenceAn unauthenticated attacker positioned on the WAN interface who can intercept and manipulate Dynamic DNS (DDNS) traffic between the modem and DDNS service providers can inject malicious code into DDNS responses that triggers a buffer overflow on the affected modem. This buffer overflow occurs specifically in the DDNS handling component of the modem's firmware when DDNS is enabled.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- Authentication
- None
- User interaction
- None
- Scope
- N
CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:N/R:U/V:D/RE:M/U:Red
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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Check if DDNS is enabled on the modemLog into the modem's web administration interface or CLI. Navigate to the Dynamic DNS (DDNS) settings section. Verify whether DDNS is currently enabled or configured.Affected if DDNS is enabled - the vulnerability only affects modems with DDNS functionality active
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Identify the installed firmware versionAccess the modem's admin panel or use CLI commands such as 'show version', 'system info', or 'router status' to retrieve the current firmware version string.Affected if Firmware version is unknown or older than vendor-released patches - compare against any available patch information from the vendor
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Confirm WAN interface exposureCheck the modem's network status to determine if the WAN interface has a public IP address and is directly reachable from the internet. Look for 'WAN IP' in the status or connection pages.Affected if Modem has a public WAN IP address and DDNS is enabled - this positions an attacker on the WAN as described in the CVE
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Inspect DDNS traffic protectionExamine the DDNS configuration for the provider in use and check if HTTPS or secure update protocols are configured for DDNS communications.Affected if DDNS updates use unencrypted HTTP - traffic can be intercepted and manipulated by a WAN-based attacker
The environment is affected if DDNS is enabled on the modem with a public WAN interface and the firmware version is unpatched; disabling DDNS removes the attack surface entirely.
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 dataCustomers should disable Dynamic DNS if not actively used, as this eliminates the attack surface entirely. For those requiring DDNS, network segmentation or VPN tunnels should be implemented to protect DDNS traffic from interception on the WAN, and vendor firmware updates should be applied when available.
- Consultation4.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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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-2024-6199 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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