How severe is CVE-2003-1378?

CVE-2003-1378 has a CVSS 2.0 base score of 8.8, rated high severity.

Is CVE-2003-1378 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-1378?

CVE-2003-1378 primarily affects Microsoft Outlook. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2003-1378?

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-2003-1378 published?

CVE-2003-1378 was published on 2003-12-31 and last updated on 2026-06-16.

CVE-2003-1378

CVE-2003-1378 is a high-severity vulnerability in Microsoft Outlook with a CVSS 2.0 base score of 8.8. Its EPSS exploit-prediction score of 16% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-264.

Key facts

Severity: High (CVSS 2.0 base score 8.8)
EPSS exploit prediction: 16% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Microsoft Outlook
Published: 2003-12-31
Last modified: 2026-06-16

Description

Microsoft Outlook Express 6.0 and Outlook 2000, with the security zone set to Internet Zone, allows remote attackers to execute arbitrary programs via an HTML email with the CODEBASE parameter set to the program, a vulnerability similar to CAN-2002-0077.

Frequently asked questions

What is CVE-2003-1378?: Microsoft Outlook Express 6.0 and Outlook 2000, with the security zone set to Internet Zone, allows remote attackers to execute arbitrary programs via an HTML email with the CODEBASE parameter set to the program, a vulnerability similar to CAN-2002-0077.
How severe is CVE-2003-1378?: CVE-2003-1378 has a CVSS 2.0 base score of 8.8, rated high severity.
Is CVE-2003-1378 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-1378?: CVE-2003-1378 primarily affects Microsoft Outlook. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-1378?: 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-2003-1378 published?: CVE-2003-1378 was published on 2003-12-31 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:a:microsoft:outlook:2000:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:outlook:2000:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:outlook:2000:sr1:*:*:*:*:*:*
cpe:2.3:a:microsoft:outlook_express:6.0:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Outlook

CVE-2001-0538 — Critical (CVSS 10.0): Microsoft Outlook View ActiveX Control in Microsoft Outlook 2002 and earlier allows remote attackers to execute…
CVE-2023-23397 — Critical (CVSS 9.8): Microsoft Outlook Elevation of Privilege Vulnerability
CVE-2013-3870 — Critical (CVSS 9.3): Double free vulnerability in Microsoft Outlook 2007 SP3 and 2010 SP1 and SP2 allows remote attackers to execute…
CVE-2010-2728 — Critical (CVSS 9.3): Heap-based buffer overflow in Microsoft Outlook 2002 SP3, 2003 SP3, and 2007 SP2, when Online Mode for an Exchange…
CVE-2010-0266 — Critical (CVSS 9.3): Microsoft Office Outlook 2002 SP3, 2003 SP3, and 2007 SP1 and SP2 does not properly verify e-mail attachments with a…
CVE-2007-0033 — Critical (CVSS 9.3): Microsoft Outlook 2002 and 2003 allows user-assisted remote attackers to execute arbitrary code via a malformed VEVENT…

All CVEs affecting Microsoft Outlook →

Other CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities

CVE-2016-8363 — Critical (CVSS 10.0): An issue was discovered in Moxa OnCell OnCellG3470A-LTE, AWK-1131A/3131A/4131A Series, AWK-3191 Series, AWK-5232/6232…
CVE-2016-7457 — Critical (CVSS 10.0): VMware vRealize Operations (aka vROps) 6.x before 6.4.0 allows remote authenticated users to gain privileges, or halt…
CVE-2015-7425 — Critical (CVSS 10.0): The Data Protection component in the VMware vSphere GUI in IBM Tivoli Storage Manager for Virtual Environments: Data…
CVE-2015-8267 — Critical (CVSS 10.0): The PasswordReset.Controllers.ResetController.ChangePasswordIndex method in PasswordReset.dll in Dovestones AD Self…
CVE-2015-7919 — Critical (CVSS 10.0): SearchBlox 8.3 before 8.3.1 allows remote attackers to write to the config file, and consequently cause a denial of…
CVE-2015-7071 — Critical (CVSS 10.0): The File Bookmark component in Apple OS X before 10.11.2 allows attackers to bypass a sandbox protection mechanism for…

Browse all CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities →