How severe is CVE-2011-1253?

CVE-2011-1253 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2011-1253 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1253?

CVE-2011-1253 primarily affects Microsoft .net Framework. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1253?

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

When was CVE-2011-1253 published?

CVE-2011-1253 was published on 2011-10-12 and last updated on 2026-06-16.

CVE-2011-1253

CVE-2011-1253 is a critical-severity vulnerability in Microsoft .net Framework with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-264.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 13% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Microsoft .net Framework
Published: 2011-10-12
Last modified: 2026-06-16

Description

Microsoft .NET Framework 1.0 SP3, 1.1 SP1, 2.0 SP2, 3.5.1, and 4, and Silverlight 4 before 4.0.60831, does not properly restrict inheritance, which allows remote attackers to execute arbitrary code via (1) a crafted XAML browser application (aka XBAP), (2) a crafted ASP.NET application, (3) a crafted .NET Framework application, or (4) a crafted Silverlight application, aka ".NET Framework Class Inheritance Vulnerability."

Frequently asked questions

What is CVE-2011-1253?: Microsoft .NET Framework 1.0 SP3, 1.1 SP1, 2.0 SP2, 3.5.1, and 4, and Silverlight 4 before 4.0.60831, does not properly restrict inheritance, which allows remote attackers to execute arbitrary code via (1) a crafted XAML browser application (aka XBAP), (2) a crafted ASP.NET application, (3) a crafted .NET Framework application, or (4) a crafted Silverlight application, aka ".NET Framework Class Inheritance Vulnerability."
How severe is CVE-2011-1253?: CVE-2011-1253 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2011-1253 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1253?: CVE-2011-1253 primarily affects Microsoft .net Framework. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1253?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2011-1253 published?: CVE-2011-1253 was published on 2011-10-12 and last updated on 2026-06-16.

References

Affected products (6)

cpe:2.3:a:microsoft:.net_framework:1.0:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_framework:1.1:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_framework:2.0:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_framework:3.5.1:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_framework:4.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:silverlight:4.0.60531.0:*:*:*:*:*:*:*

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