CVE-2024-46555
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 · uneditedDraytek Vigor 3910 v4.3.2.6 was discovered to contain a buffer overflow in the pb parameter at v2x00.cgi. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.
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 · moderate confidenceA buffer overflow vulnerability in the pb parameter of the v2x00.cgi script on Draytek Vigor 3910 routers running firmware v4.3.2.6 allows unauthenticated attackers to cause a Denial of Service via crafted input.
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= 4.3.2.6CVSS 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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Identify device modelAccess the router web interface or use SNMP/CLI to confirm the device is a Draytek Vigor 3910. Check the system status page or device info page for the exact model name.Affected if Device model is not Draytek Vigor 3910 - not affected
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Check firmware versionLocate the firmware version in the router web interface (typically under System Maintenance > Firmware Upgrade or System Status). Compare against the affected version 4.3.2.6.Affected if Firmware version is exactly 4.3.2.6 - potentially affected
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Verify v2x00.cgi script availabilityAttempt to access the v2x00.cgi script on the router (e.g., https://[router-ip]/v2x00.cgi). Check if the script responds and accepts parameters.Affected if v2x00.cgi is not found or not accessible - not affected
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Confirm web interface exposureDetermine if the router web management interface is accessible from untrusted networks. Check NAT/firewall rules and remote management settings.Affected if Web interface is exposed to untrusted networks - at higher risk of exploitation
The environment is affected if the device is a Draytek Vigor 3910 running firmware version 4.3.2.6 with the v2x00.cgi script accessible, as the buffer overflow in the pb parameter can then be exploited by unauthenticated attackers.
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 dataApply available firmware updates from Draytek; if no patch exists, restrict access to the web interface to trusted networks or disable remote management interfaces.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2024-46555 — 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-2024-46555 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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