How severe is CVE-2005-1664?

CVE-2005-1664 has a CVSS 2.0 base score of 6.4, rated medium severity.

Is CVE-2005-1664 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2005-1664?

CVE-2005-1664 primarily affects Microsoft Asp.net. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2005-1664?

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

When was CVE-2005-1664 published?

CVE-2005-1664 was published on 2005-05-18 and last updated on 2026-06-16.

CVE-2005-1664

CVE-2005-1664 is a medium-severity vulnerability in Microsoft Asp.net with a CVSS 2.0 base score of 6.4. Its EPSS exploit-prediction score of 19% places it in the 97th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 6.4)
EPSS exploit prediction: 19% (97th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Asp.net
Published: 2005-05-18
Last modified: 2026-06-16

Description

The __VIEWSTATE functionality in Microsoft ASP.NET 1.x allows remote attackers to conduct replay attacks to (1) apply a ViewState generated from one view to a different view, (2) reuse ViewState information after the application's state has changed, or (3) use the ViewState to conduct attacks or expose content to third parties.

Frequently asked questions

What is CVE-2005-1664?: The __VIEWSTATE functionality in Microsoft ASP.NET 1.x allows remote attackers to conduct replay attacks to (1) apply a ViewState generated from one view to a different view, (2) reuse ViewState information after the application's state has changed, or (3) use the ViewState to conduct attacks or expose content to third parties.
How severe is CVE-2005-1664?: CVE-2005-1664 has a CVSS 2.0 base score of 6.4, rated medium severity.
Is CVE-2005-1664 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2005-1664?: CVE-2005-1664 primarily affects Microsoft Asp.net. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2005-1664?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2005-1664 published?: CVE-2005-1664 was published on 2005-05-18 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:microsoft:asp.net:1.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:asp.net:1.1:*:*:*:*:*:*:*

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