HIGH
The "sa" account is installed with a default null password on (1) Microsoft SQL Server 2000, (2) SQL Server 7.0, and (3) Data Engine (MSDE) 1.0, including third party packages that use these products such as (4) Tumbleweed Secure Mail (MMS) (5) Compaq Insight Manager, and (6) Visio 2000, which allows remote attackers to gain privileges, as exploited by worms such as Voyager Alpha Force and Spida.
http://marc.info/?l=bugtraq&m=96333895000350&w=2
http://marc.info/?l=bugtraq&m=96593218804850&w=2
http://marc.info/?l=bugtraq&m=96644570412692&w=2
http://online.securityfocus.com/archive/1/273639
http://security-archive.merton.ox.ac.uk/bugtraq-200008/0233.html
http://support.microsoft.com/default.aspx?scid=kb;[LN];Q313418
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q321081
http://www.iss.net/security_center/static/1459.php
http://www.kb.cert.org/vuls/id/635463
http://www.microsoft.com/security/security_bulletins/ms02020_sql.asp
Source: MITRE
Published: 2002-08-12
Updated: 2018-08-13
Type: NVD-CWE-Other
Base Score: 10
Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 10
Severity: HIGH