CVE-2005-4840

Outlook Express Book Control vulnerability

CVSS

4.3

EPSS

11.5%

EPSS pct

96th

Exploited

No known

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.

Affected vendor

Microsoft

Affected product

Outlook Express Book Control

CVSS vector

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

Weakness type (CWE)

CWE-119 — Improper Restriction of Operations within Memory Bounds

Published

2005-12-31

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, medium attack complexity, requiring no authentication. Successful exploitation leads to partial impact to availability.

Its EPSS score of 11.5% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2005-4840

Confirm whether Microsoft Outlook Express Book Control is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2005-4840.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2005-4840

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2005-4840 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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