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Vulnerability record · CVE-2001-0643 · published 20 September 2001

CVE-2001-0643: Microsoft internet explorer vulnerability

Microsoft · Internet Explorer

Internet Explorer 5.5 does not display the Class ID (CLSID) when it is at the end of the file name, which could allow attackers to trick the user into executing dangerous programs by making it appear that the document is of a safe file type.

5.0 CVSS 2.0 Medium EPSS 11% · top 4.1%
5.0CVSS 2.0 base score
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
14References, 4 tagged exploit
16 Jun 2026Last modified by NVD

Description

Internet Explorer 5.5 does not display the Class ID (CLSID) when it is at the end of the file name, which could allow attackers to trick the user into executing dangerous programs by making it appear that the document is of a safe file type.

AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://vil.nai.com/vil/virusSummary.asp?virus_k=99048 ExploitPatchVendor Advisory
http://www.guninski.com/clsidext.html
http://www.osvdb.org/7858
http://www.sarc.com/avcenter/venc/data/vbs.postcard%40mm.html
http://www.securityfocus.com/archive/1/176909 ExploitPatchVendor Advisory
http://www.securityfocus.com/bid/2612
https://exchange.xforce.ibmcloud.com/vulnerabilities/6426
http://vil.nai.com/vil/virusSummary.asp?virus_k=99048 ExploitPatchVendor Advisory
http://www.guninski.com/clsidext.html
http://www.osvdb.org/7858
http://www.sarc.com/avcenter/venc/data/vbs.postcard%40mm.html
http://www.securityfocus.com/archive/1/176909 ExploitPatchVendor Advisory
http://www.securityfocus.com/bid/2612
https://exchange.xforce.ibmcloud.com/vulnerabilities/6426

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2001-0643), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.