Microsoft Windows 95/NT 4.0/2000 NetBIOS/SMB Share improper authentication

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Microsoft Windows 95/NT 4.0/2000. It has been declared as critical. This affects an unknown function of the component NetBIOS/SMB Share. The manipulation results in improper authentication. This vulnerability is cataloged as CVE-1999-0519. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Microsoft Windows 95/NT 4.0/2000 (Operating System). Affected is some unknown processing of the component NetBIOS/SMB Share. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

a netbios/smb share password is the default null or missing.

The issue has been introduced in 08/24/1995. The weakness was shared 01/01/1997. This vulnerability is traded as CVE-1999-0519. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 496 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 26920 (Microsoft Windows SMB NULL Session Authentication), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 70002 (NetBIOS Access to Shared Folders).

Upgrading to version 98, XP or Server 2003 eliminates this vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 2176.

The vulnerability is also documented in the databases at X-Force (3), Tenable (26920) and Vulnerability Center (SBV-1108†). The entry VDB-19029 is related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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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

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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Nessus ID: 26920
Nessus Name: Microsoft Windows SMB NULL Session Authentication
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 801991
OpenVAS Name: *SMBSERVER
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Windows 98/XP/Server 2003
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

ISS Proventia IPS: 🔍

Timelineinfo

08/24/1995 🔍
01/01/1997 +496 days 🔍
01/01/1997 +0 days 🔍
01/01/1997 +0 days 🔍
03/23/2003 +2272 days 🔍
10/04/2007 +1656 days 🔍
06/17/2014 +2448 days 🔍
10/26/2025 +4148 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Status: Confirmed

CVE: CVE-1999-0519 (🔍)
GCVE (CVE): GCVE-0-1999-0519
GCVE (VulDB): GCVE-100-13824
X-Force: 3
Vulnerability Center: 1108 - A NETBIOS/SMB share password is the default, null, or missing, High

See also: 🔍

Entryinfo

Created: 06/18/2014 00:18
Updated: 10/26/2025 00:26
Changes: 06/18/2014 00:18 (64), 06/21/2018 09:07 (8), 10/26/2025 00:26 (22)
Complete: 🔍
Cache ID: 216:27A:103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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