Microsoft IIS 4.0 ISAPI ASP Language memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Microsoft IIS 4.0. It has been rated as problematic. Affected by this issue is some unknown functionality of the component ISAPI ASP Handler. This manipulation of the argument Language causes memory corruption. This vulnerability appears as CVE-2000-1147. In addition, an exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Microsoft IIS 4.0 (Web Server) and classified as problematic. Affected by this vulnerability is an unknown function of the component ISAPI ASP Handler. The manipulation of the argument LANGUAGE with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Buffer overflow in IIS ISAPI .ASP parsing mechanism allows attackers to execute arbitrary commands via a long string to the "LANGUAGE" argument in a script tag.

The weakness was presented 01/09/2001 by Marc Maiffret with eEye as not defined posting (Bugtraq). It is possible to read the advisory at securityfocus.com. This vulnerability is known as CVE-2000-1147. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known.

It is possible to download the exploit at securityfocus.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $25k-$100k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 86377 (Microsoft IIS 4.0 ISAPI Buffer Overflow Vulnerability).

Upgrading to version 5.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (5510), Exploit-DB (20383), SecurityFocus (BID 1911†) and Vulnerability Center (SBV-3653†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.9
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: IIS 5.0

Timelineinfo

11/06/2000 🔍
11/06/2000 +0 days 🔍
01/09/2001 +64 days 🔍
01/09/2001 +0 days 🔍
02/04/2004 +1121 days 🔍
07/02/2014 +3801 days 🔍
10/11/2025 +4119 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: securityfocus.com⛔
Researcher: Marc Maiffret
Organization: eEye
Status: Confirmed

CVE: CVE-2000-1147 (🔍)
GCVE (CVE): GCVE-0-2000-1147
GCVE (VulDB): GCVE-100-16303
X-Force: 5510 - Microsoft Internet Information Service (IIS) ISAPI buffer overflow
SecurityFocus: 1911 - Microsoft IIS 4.0 ISAPI Buffer Overflow Vulnerability
Vulnerability Center: 3653 - Buffer overflow in IIS ISAPI .ASP Parsing Mechanism, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 07/02/2014 17:13
Updated: 10/11/2025 19:39
Changes: 07/02/2014 17:13 (68), 05/19/2019 16:27 (1), 03/25/2025 19:22 (19), 10/11/2025 19:39 (2)
Complete: 🔍
Cache ID: 216::103

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

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