CVE-2004-2137

Outlook Express vulnerability

CVSS

5.0

EPSS

26.1%

EPSS pct

98th

Exploited

No known

Outlook Express 6.0, when sending multipart e-mail messages using the "Break apart messages larger than" setting, leaks the BCC recipients of the message to the addresses listed in the To and CC fields, which may allow remote attackers to obtain sensitive information.

Affected vendor

Microsoft

Affected product

Outlook Express

CVSS vector

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

Published

2004-12-31

Risk analysis

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

Its EPSS score of 26.1% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2004-2137

Confirm whether Microsoft Outlook Express is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2004-2137.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2004-2137

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2004-2137 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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