dbcve.org
Windows 2000Operating system · Microsoft

CVE-1999-0918

HIGH · 7.8 CVSS v2.0 Published 1999-07-03
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
87/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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 · unedited
Denial of service in various Windows systems via malformed, fragmented IGMP 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 · low confidence

Denial of service vulnerability in Windows systems caused by malformed, fragmented IGMP (Internet Group Management Protocol) packets. Sending specially crafted IGMP packets can crash affected Windows systems.

MitigationApply historical Microsoft patches for this vulnerability; implement network edge filtering to block malformed IGMP packets at the perimeter; consider disabling IGMP snooping on switches if not required.

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
Windows 2000Operating system
Affected:all versions
Windows 95Operating system
Affected:all versions
Windows 98Operating system
Affected:all versions
Windows NtOperating system
Affected:= 4.0

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the Windows version
    Run 'winver' from the Start menu Run dialog, or right-click My Computer > Properties to view the Windows version and build number
    Affected if The system is running Windows 95, Windows 98, Windows 2000, or Windows NT 4.0 - any version of these operating systems is affected
  2. Confirm network stack configuration
    Open Network Connections control panel, right-click a network adapter, select Properties, and check if Internet Group Management Protocol (IGMP) is listed and checked
    Affected if The IGMP protocol is bound to and enabled on any network adapter
  3. Verify system is network-connected
    Confirm the affected Windows system has an active network connection (Ethernet or TCP/IP bound)
    Affected if The vulnerable Windows system is connected to a network where malicious IGMP packets could be received

The system is affected if it runs Windows 95, Windows 98, Windows 2000, or Windows NT 4.0 and has IGMP enabled, as these operating systems accept malformed IGMP packets that can cause a denial of service.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply historical Microsoft patches for this vulnerability; implement network edge filtering to block malformed IGMP packets at the perimeter; consider disabling IGMP snooping on switches if not required.

Fix this in Windows 2000 Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
4.0 hours of engineering $750
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-1999-0918 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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