CVE-2000-0181
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 · uneditedFirewall-1 3.0 and 4.0 leaks packets with private IP address information, which could allow remote attackers to determine the real IP address of the host that is making the connection.
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 confidenceCheck Point Firewall-1 versions 3.0 and 4.0 leak packets containing private IP address information (likely in IP headers or payload), allowing remote attackers to determine the real IP addresses of hosts behind NAT and reveal internal network topology.
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
- Partial
- Integrity
- None
- Availability
- None
AV:N/AC:L/Au:N/C:P/I:N/A:N
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 Check Point Firewall-1 versionRun 'fw ver' or check the product documentation/manuals to determine the installed Firewall-1 version numberAffected if The installed version is 3.0, 4.0, or 4.1
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Confirm NAT configurationReview the Firewall-1 policy manager or NAT rules to determine if Network Address Translation is configured for internal hostsAffected if NAT is actively configured and translating internal private addresses to public IPs
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Capture outbound traffic from Firewall-1Use packet capture (tcpdump, snoop, or FW Monitor) on the external interface to inspect outbound packets originating from behind the NATAffected if Captured packets contain unscrubbed private IP addresses (10.x.x.x, 172.16-31.x.x, 192.168.x.x) in the IP header source field or payload
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Inspect IP options or payload for leaked addressesExamine captured packets for any private IP information embedded in IP options, TCP options, or packet payload that should have been filtered or rewrittenAffected if Private IP addresses appear in any part of outbound packets beyond what NAT should have rewritten
A system is affected if it runs Check Point Firewall-1 version 3.0, 4.0, or 4.1 with NAT enabled, and outbound traffic captures reveal private IP addresses leaking in 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 Firewall-1 to a patched version beyond 4.0, or if upgrading is not feasible, implement additional filtering at upstream devices to strip private IP information from outbound traffic.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2000-0181 — 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-2000-0181 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data