How severe is CVE-2004-0121?

CVE-2004-0121 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2004-0121 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 48% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-0121?

CVE-2004-0121 primarily affects Microsoft Office. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2004-0121?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2004-0121 published?

CVE-2004-0121 was published on 2004-04-15 and last updated on 2026-06-16.

CVE-2004-0121

CVE-2004-0121 is a high-severity vulnerability in Microsoft Office with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 48% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-88.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 48% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-88
Affected product: Microsoft Office
Published: 2004-04-15
Last modified: 2026-06-16

Description

Argument injection vulnerability in Microsoft Outlook 2002 does not sufficiently filter parameters of mailto: URLs when using them as arguments when calling OUTLOOK.EXE, which allows remote attackers to use script code in the Local Machine zone and execute arbitrary programs.

Frequently asked questions

What is CVE-2004-0121?: Argument injection vulnerability in Microsoft Outlook 2002 does not sufficiently filter parameters of mailto: URLs when using them as arguments when calling OUTLOOK.EXE, which allows remote attackers to use script code in the Local Machine zone and execute arbitrary programs.
How severe is CVE-2004-0121?: CVE-2004-0121 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2004-0121 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 48% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-0121?: CVE-2004-0121 primarily affects Microsoft Office. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2004-0121?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2004-0121 published?: CVE-2004-0121 was published on 2004-04-15 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:microsoft:office:xp:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:outlook:2002:sp2:*:*:*:*:*:*

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