---
id: CVE-1999-1090
title: >-
  The default configuration of NCSA Telnet package for Macintosh and PC enables
  FTP, even though it does not include an "ftp=yes" line, which allows remote
  attackers to read and modify arbitrary files.
summary: >-
  The default configuration of NCSA Telnet package for Macintosh and PC enables
  FTP, even though it does not include an "ftp=yes" line, which allows remote
  attackers to read and modify arbitrary files.
severity: high
cvss: 7.5
cvssVector: 'AV:N/AC:L/Au:N/C:P/I:P/A:P'
published: '1991-09-10'
updated: '2026-06-16'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-1999-1090'
references:
  - url: 'http://www.cert.org/advisories/CA-1991-15.html'
    label: cve@mitre.org
  - url: 'https://exchange.xforce.ibmcloud.com/vulnerabilities/1844'
    label: cve@mitre.org
  - url: 'http://www.cert.org/advisories/CA-1991-15.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://exchange.xforce.ibmcloud.com/vulnerabilities/1844'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01661
epssPercentile: 0.75656
ingestedAt: '2026-06-19T03:39:00.689Z'
---

## Overview

The default configuration of NCSA Telnet package for Macintosh and PC enables FTP, even though it does not include an "ftp=yes" line, which allows remote attackers to read and modify arbitrary files.

## Remediation

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