CVE-2013-3588
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 · uneditedThe web management interface on Zyxel P660 devices allows remote attackers to cause a denial of service (reboot) via a flood of TCP SYN packets.
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 confidenceThe web management interface on Zyxel P660 devices is vulnerable to a TCP SYN flood attack. Attackers can remotely send a flood of TCP SYN packets to the device's web interface, causing the device to reboot due to resource exhaustion. This is a classic denial-of-service vulnerability stemming from insufficient handling of incomplete TCP connections.
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 dataall versionsall versionsall versionsall versionsall versionsall versions= v2= v2= _t1CVSS 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
- Authentication
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- Complete
AV:N/AC:L/Au:N/C:N/I:N/A:C
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 Zyxel P660 device on your networkLocate the physical device or check network inventory for a Zyxel P660 series router/modem. Confirm the model number matches: P660h 61, P660h 63, P660h 67, P660h D1, P660h D3, P660h T1, P660h T3, or P660hw variants.Affected if Device model number is one of the listed affected variants.
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Determine device firmware versionAccess the device web management interface (typically at 192.168.1.1 or similar) and navigate to Status or System Info page to view the firmware version. Alternatively, check the device label or documentation.Affected if Firmware version corresponds to the affected model variants (all versions for most models, or specific v2/_t1 variants as listed).
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Verify web management interface is enabledLog into the device administrative interface and check under Advanced Setup or System Maintenance for HTTP/HTTPS web server settings. Confirm the web management feature is turned on.Affected if Web management interface is enabled on the device.
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Check if remote web management access is allowedIn the device web interface, locate remote management settings (often under System Maintenance > Remote Management or Access Control). Determine if HTTP/HTTPS management access is permitted from WAN/remote IP addresses.Affected if Remote (WAN) access to the web management interface is enabled, exposing the device to external attackers.
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Assess network exposure of the deviceCheck your firewall or edge router configuration to determine if inbound TCP connections to port 80/443 (HTTP/HTTPS) are permitted toward the Zyxel P660 device from the internet.Affected if The device web management port is directly reachable from the internet or untrusted networks.
You are affected if you have a Zyxel P660 device from the listed models with web management enabled and accessible remotely or exposed to untrusted networks.
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 remote web management access to the Zyxel P660 device if remote access is not required, or implement network-level rate limiting and SYN proxy/cookies to mitigate the SYN flood. If available, apply vendor firmware updates.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2013-3588 — 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-2013-3588 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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