How severe is CVE-1999-1138?

CVE-1999-1138 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-1999-1138 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1138?

CVE-1999-1138 primarily affects Sco Open Desktop. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-1138?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-1999-1138 published?

CVE-1999-1138 was published on 1993-09-17 and last updated on 2026-06-16.

CVE-1999-1138

CVE-1999-1138 is a critical-severity vulnerability in Sco Open Desktop with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Sco Open Desktop
Published: 1993-09-17
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-1999-1138?: CVE-1999-1138 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-1999-1138 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1138?: CVE-1999-1138 primarily affects Sco Open Desktop. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-1138?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-1999-1138 published?: CVE-1999-1138 was published on 1993-09-17 and last updated on 2026-06-16.

References

Affected products (9)

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

More vulnerabilities in Sco Open Desktop

CVE-1999-0009 — Critical (CVSS 10.0): Inverse query buffer overflow in BIND 4.9 and BIND 8 Releases.
CVE-1999-0017 — High (CVSS 7.5): FTP servers can allow an attacker to connect to arbitrary ports on machines other than the FTP client, aka FTP bounce.
CVE-1999-1185 — High (CVSS 7.2): Buffer overflow in SCO mscreen allows local users to gain root privileges via a long terminal entry (TERM) in the…
CVE-1999-1209 — High (CVSS 7.2): Vulnerability in scoterm in SCO OpenServer 5.0 and SCO Open Desktop/Open Server 3.0 allows local users to gain root…
CVE-1999-0033 — High (CVSS 7.2): Command execution in Sun systems via buffer overflow in the at program.
CVE-1999-0023 — High (CVSS 7.2): Local user gains root privileges via buffer overflow in rdist, via lookup() function.

All CVEs affecting Sco Open Desktop →