Microsoft Windows NT 4.0 Terminal Server improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Microsoft Windows NT 4.0. Impacted is an unknown function of the component Terminal Server. This manipulation causes improper authentication. This vulnerability is tracked as CVE-1999-0680. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Microsoft Windows NT 4.0 (Operating System). It has been declared as problematic. Affected by this vulnerability is an unknown code of the component Terminal Server. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect availability. The summary by CVE is:

Windows NT Terminal Server performs extra work when a client opens a new connection but before it is authenticated, allowing for a denial of service.

The weakness was disclosed 08/09/1999 with ISS X-Force as MS99-028 as confirmed bulletin (Technet). It is possible to read the advisory at microsoft.com. This vulnerability is known as CVE-1999-0680. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2000 eliminates this vulnerability. Applying the patch MS99-028 is able to eliminate this problem. The bugfix is ready for download at microsoft.com. The problem might be mitigated by replacing the product with Citrix as an alternative. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at X-Force (3104), SecurityFocus (BID 571†) and Vulnerability Center (SBV-4250†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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: Improper authentication
CWE: CWE-287
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: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Windows 2000
Patch: MS99-028
Alternative: Citrix

Timelineinfo

08/09/1999 🔍
08/09/1999 +0 days 🔍
08/09/1999 +0 days 🔍
08/09/1999 +0 days 🔍
05/04/2004 +1730 days 🔍
06/21/2014 +3700 days 🔍
04/19/2026 +4320 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: MS99-028
Organization: ISS X-Force
Status: Confirmed

CVE: CVE-1999-0680 (🔍)
GCVE (CVE): GCVE-0-1999-0680
GCVE (VulDB): GCVE-100-14767
X-Force: 3104
SecurityFocus: 571 - NT Terminal Server Multiple Connection Request DoS Vulnerability
Vulnerability Center: 4250 - [MS99-028] Windows NT Terminal Server Allows DoS, Medium

Entryinfo

Created: 06/21/2014 19:09
Updated: 04/19/2026 10:03
Changes: 06/21/2014 19:09 (45), 05/21/2019 12:40 (20), 04/19/2026 10:03 (16)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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