---
id: CVE-1999-1162
title: >-
  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 into the
  system.
summary: >-
  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 into the
  system.
severity: medium
cvss: 6.4
cvssVector: 'AV:N/AC:L/Au:N/C:N/I:P/A:P'
published: '1993-05-24'
updated: '2026-06-16'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-1999-1162'
references:
  - url: 'http://www.cert.org/advisories/CA-1993-08.html'
    label: cve@mitre.org
  - url: 'http://www.iss.net/security_center/static/542.php'
    label: cve@mitre.org
  - url: 'http://www.cert.org/advisories/CA-1993-08.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.iss.net/security_center/static/542.php'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01155
epssPercentile: 0.65606
ingestedAt: '2026-06-19T03:39:00.717Z'
---

## Overview

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 into the system.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.