NCSA Telnet ftp=yes privileges management

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in NCSA Telnet. The impacted element is an unknown function. Executing a manipulation of the argument ftp=yes can lead to privileges management. This vulnerability is handled as CVE-1999-1090. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical was found in NCSA Telnet (Remote Access Software) (version unknown). This vulnerability affects an unknown function. The manipulation of the argument ftp=yes with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was released 09/10/1991 as CA-1991-15 as confirmed advisory (CERT.org). The advisory is shared for download at cert.org. This vulnerability was named CVE-1999-1090. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at X-Force (1844). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

09/10/1991 🔍
09/10/1991 +0 days 🔍
06/16/2014 +8315 days 🔍
04/16/2026 +4322 days 🔍

Sourcesinfo

Advisory: CA-1991-15
Status: Confirmed

CVE: CVE-1999-1090 (🔍)
GCVE (CVE): GCVE-0-1999-1090
GCVE (VulDB): GCVE-100-13636
X-Force: 1844 - NCSA Telnet FTP server allows remote users read/write access to computer

Entryinfo

Created: 06/16/2014 15:30
Updated: 04/16/2026 04:11
Changes: 06/16/2014 15:30 (40), 04/03/2019 11:47 (12), 04/03/2025 05:35 (16), 04/16/2026 04:11 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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