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NVD / CVE Program· CNA mitre

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

Noroxi assessment

Priority: Plan (action score 40/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.5% (FIRST EPSS); higher than 75.2% of all records.
  • No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Add it to your regular patch cycle. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

CriticalCVSS 10.0 · v2.0—No exploit No fix recorded
Published
Sep 17, 1993
Updated
Jun 16, 2026
EPSS
1.5% · 75th percentile
CWE
—

Report tools

JSON

Action score

40

Plan

Add it to your regular patch cycle.

CVSS
40 / 40 · 10.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.5%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-1999-1138

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
scoopen desktop
scoopen desktop lite
scoopenserver
scounix

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • sco open desktop1.0
  • sco open desktop2.0
  • sco open desktop3.0
  • sco open desktop lite3.0
  • sco openserver3.0
  • sco unixsystem_v386_3.2_operating_system
  • sco unixsystem_v386_3.2_operating_system_2.0
  • sco unixsystem_v386_3.2_operating_system_4.0
  • sco unixsystem_v386_3.2_operating_system_4.x

Same product

sco: all records

Other highest-scoring records for the same primary product.

  • CVE-1999-1209Vulnerability in scoterm in SCO OpenServer 5.0 and SCO Open Desktop/Open Server 3.0 allows local users to gain root privileges.
    28Monitor
  • CVE-1999-1303Vulnerability in prwarn in SCO UNIX 4.2 and earlier allows local users to gain root access.
    28Monitor
  • CVE-1999-1304Vulnerability in login in SCO UNIX 4.2 and earlier allows local users to gain root access.
    28Monitor

Published before and after this one in the same product

  • ← EarlierCVE-1999-1162May 24, 1993 · Vulnerability in passwd in SCO UNIX 4.0 and earlier allows attackers to cause a denial of service by preventing users from being able to log
    25Monitor
  • Later →CVE-1999-1302Nov 30, 1994 · Unspecified vulnerability in pt_chmod in SCO UNIX 4.2 and earlier allows local users to gain root access.
    28Monitor
  • Later →CVE-1999-1305Nov 30, 1994 · Vulnerability in "at" program in SCO UNIX 4.2 and earlier allows local users to gain root access.
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
C · data can be read
Integrity
C · data or configuration can be modified
Availability
C · the service can be disrupted
Attack complexity
Low
Confidentiality impact
C
Integrity impact
C
Availability impact
C

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records