Microsoft Windows NT 4.0/2000 Local Security Authority Subsystem LSA Request input validation

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Microsoft Windows NT 4.0/2000. It has been classified as problematic. This issue affects some unknown processing of the component Local Security Authority Subsystem. Performing a manipulation as part of LSA Request results in input validation. This vulnerability was named CVE-1999-0721. There is no available exploit. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability classified as critical has been found in Microsoft Windows NT 4.0/2000 (Operating System). This affects an unknown code block of the component Local Security Authority Subsystem. The manipulation as part of a LSA Request leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. The summary by CVE is:

Denial of service in Windows NT Local Security Authority (LSA) through a malformed LSA request.

The weakness was presented 07/20/1999 with BindView as MS99-020 as confirmed bulletin (Technet). The advisory is shared at microsoft.com. This vulnerability is uniquely identified as CVE-1999-0721. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

Upgrading to version XP or 2000 eliminates this vulnerability. Applying the patch MS99-020 is able to eliminate this problem. The bugfix is ready for download at microsoft.com. The best possible mitigation is suggested to be patching the affected component.

The vulnerability is also documented in the databases at X-Force (2291), SecurityFocus (BID 465†) and Vulnerability Center (SBV-26†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
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: Input validation
CWE: CWE-20
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: Patch
Status: 🔍

0-Day Time: 🔍

Upgrade: Windows XP/2000
Patch: MS99-020
McAfee IPS: 🔍
McAfee IPS Version: 🔍

ISS Proventia IPS: 🔍

Timelineinfo

06/23/1999 🔍
07/20/1999 +27 days 🔍
07/20/1999 +0 days 🔍
07/20/1999 +0 days 🔍
10/08/2002 +1176 days 🔍
06/21/2014 +4274 days 🔍
04/19/2026 +4320 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: MS99-020
Organization: BindView
Status: Confirmed

CVE: CVE-1999-0721 (🔍)
GCVE (CVE): GCVE-0-1999-0721
GCVE (VulDB): GCVE-100-14733
X-Force: 2291
SecurityFocus: 465 - NT LSA DoS (Phantom) Vulnerability
Vulnerability Center: 26 - [MS99-020] DoS in Windows NT Local Security Authority (LSA), High

Entryinfo

Created: 06/21/2014 12:12
Updated: 04/19/2026 08:57
Changes: 06/21/2014 12:12 (65), 05/04/2019 16:56 (3), 04/19/2026 08:57 (16)
Complete: 🔍
Cache ID: 216::103

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