CVE-2024-46596
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 sAct 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 exists in the sAct parameter of the v2x00.cgi web interface on Draytek Vigor 3910 devices running firmware v4.3.2.6. Attackers can send specially crafted input that overflows a buffer, causing the device to crash and resulting in a Denial of Service condition.
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 the device modelLog into the device's web管理界面 or check the device label to confirm the model is Draytek Vigor 3910Affected if The device is not a Draytek Vigor 3910, then this CVE does not apply
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Check the installed firmware versionNavigate to the web interface System Maintenance > Firmware Upgrade or System Status page to view the current firmware versionAffected if The firmware version is exactly 4.3.2.6 - this is the affected version
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Verify if the v2x00.cgi endpoint is accessibleAttempt to access https://<device_ip>/v2x00.cgi from an authorized network location to confirm the web interface is reachableAffected if The v2x00.cgi endpoint is accessible from untrusted networks - exploitation requires sending HTTP requests to this CGI script
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Check for signs of device crash or unresponsivenessAttempt to access the web interface or ping the device to verify it is responsive. Review any system logs available via the web interface for crash indicatorsAffected if The device is unresponsive, crashing repeatedly, or showing signs of a denial of service condition since the vulnerability causes crashes
You are affected if you have a Draytek Vigor 3910 device running firmware version 4.3.2.6 with the web interface accessible, especially if the device exhibits crashes or unresponsiveness.
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 any available firmware update from Draytek. If no patch exists, restrict network access to the device's web management interface to trusted sources only, as exploitation requires sending HTTP requests to v2x00.cgi.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2024-46596 — 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-2024-46596 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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