Microsoft IIS 4.0/5.0 nsiislog.dll denial of service

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability classified as critical was found in Microsoft IIS 4.0/5.0 (Web Server). This vulnerability affects an unknown code block in the library nsiislog.dll. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability.

The bug was discovered 05/28/2003. The weakness was disclosed 05/30/2003 by Brett Moore as MS03-019 as confirmed bulletin (Technet). The advisory is available at This vulnerability was named CVE-2003-0349 since 05/28/2003. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

After 4 weeks, there has been an exploit disclosed. It is possible to download the exploit at It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 101016 (GLSA-201706-21 : nettle: Information disclosure), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l.

Applying the patch MS03-019 is able to eliminate this problem. The bugfix is ready for download at A possible mitigation has been published 16 years after the disclosure of the vulnerability. Attack attempts may be identified with Snort ID 2129.

The vulnerability is also documented in the databases at X-Force (12652) and Tenable (101016). Additional details are provided at The entries 15, 84, 86 and 85 are pretty similar.







CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.5
VulDB Temp Score: 7.0
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Class: Denial of service
CWE: CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
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Nessus ID: 101016
Nessus Name: GLSA-201706-21 : nettle: Information disclosure
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OpenVAS ID: 802888
OpenVAS Name: Microsoft Windows Media Services ISAPI Extension Code Execution Vulnerabilities
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MetaSploit ID: ms03_022_nsiislog_post.rb
MetaSploit Name: MS03-022 Microsoft IIS ISAPI nsiislog.dll ISAPI POST Overflow
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Threat Intelligenceinfo

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Recommended: Patch
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Patch: MS03-019

Snort ID: 2129
Snort Message: SERVER-IIS nsiislog.dll access
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05/28/2003 🔍
05/28/2003 +0 days 🔍
05/30/2003 +2 days 🔍
05/30/2003 +0 days 🔍
06/25/2003 +26 days 🔍
06/25/2003 +0 days 🔍
06/25/2003 +0 days 🔍
06/25/2003 +0 days 🔍
07/24/2003 +29 days 🔍
07/28/2003 +4 days 🔍
06/22/2017 +5077 days 🔍
06/23/2017 +1 days 🔍
07/24/2019 +761 days 🔍



Advisory: MS03-019
Researcher: Brett Moore
Status: Confirmed

CVE: CVE-2003-0349 (🔍)

X-Force: 12652 - Microsoft Windows 2000 and NT 4.0 Server IIS ISAPI nsiislog.dll extension POST request buffer overflow, High Risk
SecurityTracker: 1007059
SecurityFocus: 8035 - Microsoft Windows Media Services NSIISlog.DLL Remote Buffer Overflow Vulnerability
Secunia: 9115
OSVDB: 4535 - Microsoft Media Services ISAPI nsiislog.dll POST Overflow

scip Labs:
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Created: 05/30/2003 02:00 AM
Updated: 07/24/2019 04:38 PM
Changes: 05/30/2003 02:00 AM (105), 07/24/2019 04:38 PM (3)
Complete: 🔍


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