Is CVE-2011-1253 in the CISA KEV catalog?

No. CVE-2011-1253 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-1253?

CVE-2011-1253 has a CVSS v2 base score of 9.3 (HIGH).

What is the EPSS score for CVE-2011-1253?

CVE-2011-1253 has an EPSS score of 13.24% (96th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2011-1253

HIGHEPSS 96th pctl

9.3

CVSS v2

NVD

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."

CWE-264

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

13.24%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.