CVE-2004-2137

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.

Published: 2004-12-31 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2004-2137 is rated Moderate Risk (58.3/100): CVSS Medium severity, with high exploitation likelihood (EPSS 26.14%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +4.14% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2004-2137

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 22.00% 26.14% +4.14%
2 2026-06-06 33.17% 22.00% -11.17%
3 2025-07-13 — 33.17% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2004-2137

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2004-2137

Affected software / configurations for CVE-2004-2137

Vendor Product Version Raw CPE
microsoft outlook_express 6.0 cpe:2.3:a:microsoft:outlook_express:6.0:*:*:*:*:*:*:*
microsoft outlook_express 6.0 cpe:2.3:a:microsoft:outlook_express:6.0:sp1:*:*:*:*:*:*

References for CVE-2004-2137

cvelogic Threat Intelligence