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Vulnerability record · CVE-2005-4840 · published 31 December 2005

CVE-2005-4840: Microsoft outlook express book control memory buffer overflow vulnerability

Microsoft · Outlook Express Book Control

The Outlook Express Address Book control, when using Internet Explorer 6, allows remote attackers to cause a denial of service (NULL dereference and browser crash) by creating the OutlookExpress.AddressBook COM object, which is not intended for use within Internet Explorer.

4.3 CVSS 2.0 Medium EPSS 12% · top 4.1% CWE-119 · Memory buffer overflow
4.3CVSS 2.0 base score
12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
16 Jun 2026Last modified by NVD

Description

The Outlook Express Address Book control, when using Internet Explorer 6, allows remote attackers to cause a denial of service (NULL dereference and browser crash) by creating the OutlookExpress.AddressBook COM object, which is not intended for use within Internet Explorer.

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

Affected products

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

References

LinkTags
http://browserfun.blogspot.com/2006/07/mobb-3-outlookexpressaddressbook_02.html
http://www.osvdb.org/26836
http://www.securityfocus.com/archive/1/391803
http://www.securityfocus.com/archive/1/470694/100/0/threaded
https://exchange.xforce.ibmcloud.com/vulnerabilities/34755
http://browserfun.blogspot.com/2006/07/mobb-3-outlookexpressaddressbook_02.html
http://www.osvdb.org/26836
http://www.securityfocus.com/archive/1/391803
http://www.securityfocus.com/archive/1/470694/100/0/threaded
https://exchange.xforce.ibmcloud.com/vulnerabilities/34755

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

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Source: NIST National Vulnerability Database (record CVE-2005-4840), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.