How severe is CVE-2005-0420?

CVE-2005-0420 has a CVSS 2.0 base score of 5.8, rated medium severity.

Is CVE-2005-0420 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2005-0420?

CVE-2005-0420 primarily affects Microsoft Exchange Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2005-0420?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2005-0420 published?

CVE-2005-0420 was published on 2005-04-27 and last updated on 2026-06-16.

CVE-2005-0420

CVE-2005-0420 is a medium-severity vulnerability in Microsoft Exchange Server with a CVSS 2.0 base score of 5.8. Its EPSS exploit-prediction score of 26% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 2.0 base score 5.8)
EPSS exploit prediction: 26% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-601
Affected product: Microsoft Exchange Server
Published: 2005-04-27
Last modified: 2026-06-16

Description

Microsoft Outlook Web Access (OWA), when used with Exchange, allows remote attackers to redirect users to arbitrary URLs for login via a link to the owalogon.asp application.

Frequently asked questions

What is CVE-2005-0420?: Microsoft Outlook Web Access (OWA), when used with Exchange, allows remote attackers to redirect users to arbitrary URLs for login via a link to the owalogon.asp application.
How severe is CVE-2005-0420?: CVE-2005-0420 has a CVSS 2.0 base score of 5.8, rated medium severity.
Is CVE-2005-0420 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2005-0420?: CVE-2005-0420 primarily affects Microsoft Exchange Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2005-0420?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2005-0420 published?: CVE-2005-0420 was published on 2005-04-27 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:microsoft:exchange_server:2003:-:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2003:sp1:*:*:*:*:*:*

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