Microsoft Windows NT 4.0 Terminal Server RegAPI.DLL memory corruption

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.0	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in Microsoft Windows NT 4.0. This vulnerability affects unknown code in the library RegAPI.DLL of the component Terminal Server. Performing a manipulation results in memory corruption. This vulnerability is known as CVE-2000-1149. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Microsoft Windows NT 4.0 (Operating System). It has been classified as critical. This affects some unknown functionality in the library RegAPI.DLL of the component Terminal Server. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Buffer overflow in RegAPI.DLL used by Windows NT 4.0 Terminal Server allows remote attackers to execute arbitrary commands via a long username, aka the "Terminal Server Login Buffer Overflow" vulnerability.

The weakness was published 01/09/2001 with Core as not defined posting (Bugtraq). The advisory is shared at securityfocus.com. This vulnerability is uniquely identified as CVE-2000-1149. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 90059 (Windows NT 4.0 Terminal Server RegAPI.DLL Buffer Overflow Vulnerability).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (5489), SecurityFocus (BID 1924†) and Vulnerability Center (SBV-3728†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• NT 4.0

License

• commercial

Website

• Vendor: https://www.microsoft.com/
• Product: https://www.microsoft.com/en-us/windows

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/08/2000 🔍
11/08/2000 +0 days 🔍
01/09/2001 +62 days 🔍
01/09/2001 +0 days 🔍
02/15/2004 +1132 days 🔍
07/02/2014 +3790 days 🔍
10/11/2025 +4119 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: securityfocus.com⛔
Organization: Core
Status: Confirmed

CVE: CVE-2000-1149 (🔍)
GCVE (CVE): GCVE-0-2000-1149
GCVE (VulDB): GCVE-100-16305
X-Force: 5489 - Microsoft Windows NT Terminal Server GINA RegAPI.DLL buffer overflow
SecurityFocus: 1924 - Windows NT 4.0 Terminal Server RegAPI.DLL Buffer Overflow
Vulnerability Center: 3728 - [MS00-087] Buffer Overflow in Windows NT4.0 Terminal Server RegAPI.DLL via a Long Username, High

Entryinfo

Created: 07/02/2014 17:15
Updated: 10/11/2025 19:39
Changes: 07/02/2014 17:15 (41), 05/19/2019 17:33 (22), 10/11/2025 19:39 (20)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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