What is CVE-1999-0918?

CVE-1999-0918 is a vulnerability in Microsoft Windows 2000, classified under Improper Input Validation. Published 1999-07-03.

Is CVE-1999-0918 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Microsoft Windows 2000

CVE-1999-0918

Denial of service in various Windows systems via malformed, fragmented IGMP packets.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 1999-07-03 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 7.8 (High). Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.264 (97.9th percentile), scored 2026-09-28.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.264 · newest: 0.264 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

www.securityfocus.com/bid/514 (vdb-entry)
docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-034 (vendor-advisory)
support.microsoft.com/default.aspx (vendor-advisory)

Frequently asked questions

What is CVE-1999-0918?: CVE-1999-0918 is a vulnerability in Microsoft Windows 2000, classified under Improper Input Validation. Published 1999-07-03.
Is CVE-1999-0918 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.