Microsoft Internet Explorer 5.01 SP4/6 SP1 HTML Document mshtml.dll memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability categorized as very critical has been discovered in Microsoft Internet Explorer 5.01 SP4/6 SP1. This affects an unknown part in the library mshtml.dll of the component HTML Document Handler. Executing a manipulation can lead to memory corruption. This vulnerability is registered as CVE-2006-2382. It is possible to launch the attack remotely. No exploit is available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability has been found in Microsoft Internet Explorer 5.01 SP4/6 SP1 (Web Browser) and classified as critical. This vulnerability affects an unknown functionality in the library mshtml.dll of the component HTML Document Handler. The manipulation 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. CVE summarizes:

Heap-based buffer overflow in Microsoft Internet Explorer 5.01 SP4 and 6 SP1 and earlier allows remote attackers to execute arbitrary code via crafted UTF-8 encoded HTML that results in size discrepancies during conversion to Unicode, aka "HTML Decoding Memory Corruption Vulnerability."

The weakness was published 06/13/2006 by Andreas Sandblad with TippingPoint and the Zero Day Initiative as MS06-021 as confirmed bulletin (Technet). The advisory is available at microsoft.com. This vulnerability was named CVE-2006-2382 since 05/15/2006. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

It is declared as proof-of-concept. As 0-day the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 21685 (MS06-021: Cumulative Security Update for Internet Explorer (916281)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins. The commercial vulnerability scanner Qualys is able to test this issue with plugin 100035 (Cumulative Security Update for Internet Explorer Missing (MS06-021)).

Applying the patch MS06-021 is able to eliminate this problem. The bugfix is ready for download at windowsupdate.microsoft.com. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 4440.

The vulnerability is also documented in the databases at X-Force (26766), Tenable (21685), SecurityFocus (BID 18309†), OSVDB (26443†) and Secunia (SA20595†). Similar entries are available at VDB-2126, VDB-2289, VDB-2291 and VDB-2292. If you want to get best quality of vulnerability data, you may have to visit VulDB.

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CVSSv4info

VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 5.7

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

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EPSS Percentile: 🔍

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Nessus ID: 21685
Nessus Name: MS06-021: Cumulative Security Update for Internet Explorer (916281)
Nessus File: 🔍
Nessus Risk: 🔍
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
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0-Day Time: 🔍

Patch: MS06-021
TippingPoint: 🔍

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Timelineinfo

05/15/2006 🔍
06/13/2006 +28 days 🔍
06/13/2006 +0 days 🔍
06/13/2006 +0 days 🔍
06/13/2006 +0 days 🔍
06/13/2006 +0 days 🔍
06/14/2006 +0 days 🔍
06/14/2006 +0 days 🔍
06/22/2025 +6948 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: MS06-021
Researcher: Andreas Sandblad
Organization: TippingPoint and the Zero Day Initiative
Status: Confirmed

CVE: CVE-2006-2382 (🔍)
GCVE (CVE): GCVE-0-2006-2382
GCVE (VulDB): GCVE-100-2290

OVAL: 🔍

CERT: 🔍
X-Force: 26766 - Microsoft Internet Explorer UTF8 encoded HTML code execution, High Risk
SecurityFocus: 18309 - Microsoft Internet Explorer HTML Decoding Remote Code Execution Vulnerability
Secunia: 20595 - Microsoft Internet Explorer Multiple Vulnerabilities, Highly Critical
OSVDB: 26443
SecurityTracker: 1016291 - Microsoft Internet Explorer Multiple Memory and Access Control Errors Let Remote Users Execute Arbitrary Code
Vulnerability Center: 11909 - [MS06-021] Internet Explorer Code Execution via Crafted UTF-8 Encoded HTML, Medium
Vupen: ADV-2006-2319

See also: 🔍

Entryinfo

Created: 06/14/2006 12:07
Updated: 06/22/2025 05:23
Changes: 06/14/2006 12:07 (60), 04/07/2017 12:01 (36), 03/13/2021 07:44 (3), 03/13/2021 07:49 (1), 01/20/2025 16:06 (15), 06/22/2025 05:23 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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