Is CVE-2014-4121 being actively exploited?

CVE-2014-4121 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2014-4121?

CVE-2014-4121 has a CVSS 2.0 base score of 10.0 (HIGH).

CVE-2014-4121

HIGH · CVSS 10.0EPSS 19.2%EU EUVD

Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized resource identifiers, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted request to a .NET web application, aka ".NET Framework Remote Code Execution Vulnerability."

Key facts

CVSS score: 10.0 (v2.0)
Severity: HIGH
CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Weakness (CWE): CWE-399
EPSS score: 19.2% (97th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2014-4052)
Published: October 15, 2014
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2014-4052 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

microsoft / .net framework
microsoft / .net framework
microsoft / .net framework
microsoft / .net framework
microsoft / .net framework
microsoft / .net framework
microsoft / .net framework

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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