CVE-2000-0809
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 · uneditedBuffer overflow in Getkey in the protocol checker in the inter-module communication mechanism in Check Point VPN-1/FireWall-1 4.1 and earlier allows remote attackers to cause a denial of service.
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 confidenceBuffer overflow in the Getkey function within the protocol checker of the inter-module communication mechanism in Check Point VPN-1/FireWall-1 4.1 and earlier allows remote attackers to cause a denial of service via crafted packets.
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= 3.0= 4.0= 4.1CVSS 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
- Partial
AV:N/AC:L/Au:N/C:N/I:N/A:P
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 installed Firewall-1 versionRun 'fw ver' or check the product version through Check Point management interface (smartconsole or legacy GUI). On the firewall module, you can also check the version through the operating system if Check Point packages are installed.Affected if The installed version is 3.0, 4.0, or 4.1, which fall within the affected version range.
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Confirm the inter-module communication componentVerify that the Check Point Firewall-1 inter-module communication mechanism (often referred to as the FW1 API or internal communication between Check Point components) is present and operational. This is typically enabled by default in standard Firewall-1 installations.Affected if The inter-module communication mechanism is present, as the vulnerability resides in the Getkey function within its protocol checker.
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Check network exposure of management and inter-module portsReview firewall rules and network configuration to determine if the management interface (default port 257) or other Check Point internal communication ports are exposed to untrusted networks. Use 'netstat -an' or similar network inspection to identify listening Check Point services.Affected if The management interface or inter-module communication ports are accessible from untrusted networks, allowing remote attackers to send crafted packets.
You are affected if your Check Point Firewall-1 installation is version 4.1 or earlier (3.0, 4.0, or 4.1) and the management or inter-module communication interface is reachable from network segments where untrusted parties could send crafted packets.
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 dataUpgrade to a supported version of Check Point VPN-1/FireWall-1 beyond version 4.1, or apply vendor-supplied patches if available for legacy installations.
- Consultation2.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2000-0809 — 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-2000-0809 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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