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CVE-2005-4840

4.3 · MEDIUM

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.Ad…

Published Dec 31, 2005microsoftCWE-119EPSS 11.52%

Overview

CVE-2005-4840 is a medium-severity vulnerability affecting microsoft outlook_express_book_control. It was published on December 31, 2005 and has a CVSS 2.0 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from microsoft. Update outlook_express_book_control to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refbrowserfun.blogspot.com/2006/07/mobb-3-outlookexpressaddressbook_02.htmlRefwww.osvdb.org/26836Refwww.securityfocus.com/archive/1/391803Refwww.securityfocus.com/archive/1/470694/100/0/threadedRefexchange.xforce.ibmcloud.com/vulnerabilities/34755Refbrowserfun.blogspot.com/2006/07/mobb-3-outlookexpressaddressbook_02.htmlRefwww.osvdb.org/26836Refwww.securityfocus.com/archive/1/391803Refwww.securityfocus.com/archive/1/470694/100/0/threadedRefexchange.xforce.ibmcloud.com/vulnerabilities/34755

How CyberStrike helps

Frequently asked questions

What is CVE-2005-4840?

CVE-2005-4840 is a medium-severity vulnerability affecting microsoft outlook_express_book_control. It was published on December 31, 2005 and has a CVSS 2.0 base score of 4.3 (MEDIUM).

How severe is CVE-2005-4840?

This vulnerability has a CVSS 2.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2005-4840?

Check the references section for vendor advisories and patches from microsoft. Update outlook_express_book_control to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2005-4840?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2005-4840 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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