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CVE-1999-1138

25
FAUCET Score

CVE-1999-1138 describes a critical vulnerability in SCO UNIX System V/386 Release 3.2 and other SCO products, where world-writable home directories for the 'dos' and 'asg' users were created in /tmp and /usr/tmp, respectively. This misconfiguration allows any local user to gain unauthorized access to these accounts. With a CVSS score of 10.0 (HIGH), this vulnerability presents a severe risk due to its network-accessible attack vector, low complexity, and complete compromise of confidentiality, integrity, and availability. Despite its age and high severity, there is no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed on the KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
1.0CPE matchmatch criteria
cpe:2.3:o:sco:open_desktop:1.0:*:*:*:*:*:*:*
2.0CPE matchmatch criteria
cpe:2.3:o:sco:open_desktop:2.0:*:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:o:sco:open_desktop:3.0:*:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:o:sco:open_desktop_lite:3.0:*:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:o:sco:openserver:3.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

10.0HIGH

AV:N/AC:L/Au:N/C:C/I:C/A:C

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.58%
Probability of exploitation in next 30 days
EPSS Percentile
72.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0158 is in the 55th percentile among its peer group of 51,485 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

exchange.xforce.ibmcloud.com / vulnerabilities/546
cert.org / advisories/CA-1993-13.html
US Government Resource