CVE-2004-0203

Cross-site scripting (XSS) vulnerability in Outlook Web Access for Exchange Server 5.5 Service Pack 4 allows remote attackers to insert arbitrary script and spoof content in HTML email or web caches via an HTML redirect query.

Published: 2004-11-23 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2004-0203 is rated Moderate Risk (45.3/100): CVSS Medium severity, with high exploitation likelihood (EPSS 14.70%, 95th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. 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-2004-0203

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 2026-04-17 25.67% 14.70% -10.97%
2 2025-03-30 35.76% 25.67% -10.09%
3 2025-03-29 — 35.76% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2004-0203

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2004-0203

Affected software / configurations for CVE-2004-0203

Vendor Product Version Raw CPE
microsoft exchange_server 5.5 cpe:2.3:a:microsoft:exchange_server:5.5:-:*:*:*:*:*:*
microsoft exchange_server 5.5 cpe:2.3:a:microsoft:exchange_server:5.5:sp1:*:*:*:*:*:*
microsoft exchange_server 5.5 cpe:2.3:a:microsoft:exchange_server:5.5:sp2:*:*:*:*:*:*
microsoft exchange_server 5.5 cpe:2.3:a:microsoft:exchange_server:5.5:sp3:*:*:*:*:*:*
microsoft exchange_server 5.5 cpe:2.3:a:microsoft:exchange_server:5.5:sp4:*:*:*:*:*:*

References for CVE-2004-0203

cvelogic Threat Intelligence