What is CVE-1999-0506?

CVE-1999-0506 is a vulnerability in Microsoft Windows 2000. Published 1998-10-01.

Is CVE-1999-0506 known to be exploited?

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

Vulnerability in Microsoft Windows 2000

CVE-1999-0506

A Windows NT domain user or administrator account has a default, null, blank, or missing password.

Published 1998-10-01 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 7.2 (High). Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.172 (97.0th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.172 · newest: 0.172 · change: 0.000

Affected products

Public proof-of-concept exploits

References

www.cve.org/CVERecord

Frequently asked questions

What is CVE-1999-0506?: CVE-1999-0506 is a vulnerability in Microsoft Windows 2000. Published 1998-10-01.
Is CVE-1999-0506 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.