CVE-1999-1138

SCO UNIX System V/386 Release 3.2, and other SCO products, installs the home directories (1) /tmp for the dos user, and (2) /usr/tmp for the asg user, which allows other users to gain access to those accounts since /tmp and /usr/tmp are world-writable.

Published: 1993-09-17 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-1999-1138 is rated High Risk (68.3/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.19%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-1999-1138

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-12 0.53% 1.19% +0.65%
2 2025-09-29 0.72% 0.53% -0.19%
3 2025-03-30 — 0.72% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-1999-1138

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-1999-1138

Affected software / configurations for CVE-1999-1138

Vendor Product Version Raw CPE
sco open_desktop 1.0 cpe:2.3:o:sco:open_desktop:1.0:*:*:*:*:*:*:*
sco open_desktop 2.0 cpe:2.3:o:sco:open_desktop:2.0:*:*:*:*:*:*:*
sco open_desktop 3.0 cpe:2.3:o:sco:open_desktop:3.0:*:*:*:*:*:*:*
sco open_desktop_lite 3.0 cpe:2.3:o:sco:open_desktop_lite:3.0:*:*:*:*:*:*:*
sco openserver 3.0 cpe:2.3:o:sco:openserver:3.0:*:*:*:*:*:*:*
sco unix system_v386_3.2_operating_system cpe:2.3:o:sco:unix:system_v386_3.2_operating_system:*:*:*:*:*:*:*
sco unix system_v386_3.2_operating_system_2.0 cpe:2.3:o:sco:unix:system_v386_3.2_operating_system_2.0:*:*:*:*:*:*:*
sco unix system_v386_3.2_operating_system_4.0 cpe:2.3:o:sco:unix:system_v386_3.2_operating_system_4.0:*:*:*:*:*:*:*
sco unix system_v386_3.2_operating_system_4.x cpe:2.3:o:sco:unix:system_v386_3.2_operating_system_4.x:*:*:*:*:*:*:*

References for CVE-1999-1138

cvelogic Threat Intelligence