CVE-2014-4121 — 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."

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HIGH

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."

Published Oct 15, 2014

10.0

HIGH

CVSS 2.0

EPSS 19.23%

Description

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."

Affected products

Remediation

No remediation recorded yet.

Metrics

19.23% 0.19227

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.19227

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (16 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	19.23% (0.19227)	97.26th	v5 (v2026.06.15)
Jun 15, 2026	19.23% (0.19227)	96.97th	v5 (v2026.06.15)
Mar 30, 2025	42.52% (0.42520)	97.19th	v4 (v2025.03.14)
Mar 29, 2025	56.13% (0.56127)	97.25th	v4 (v2025.03.14)
Mar 23, 2025	42.52% (0.42520)	97.06th	v4 (v2025.03.14)
Mar 19, 2025	40.13% (0.40130)	96.91th	v4 (v2025.03.14)
Mar 17, 2025	41.99% (0.41995)	97.12th	v4 (v2025.03.14)
Dec 12, 2024	94.25% (0.94246)	99.29th	v3 (v2023.03.01)
Jul 11, 2024	94.47% (0.94468)	99.24th	v3 (v2023.03.01)
Aug 5, 2023	92.62% (0.92620)	98.60th	v3 (v2023.03.01)
May 10, 2023	95.10% (0.95103)	98.91th	v3 (v2023.03.01)
Mar 7, 2023	96.00% (0.95999)	99.08th	v3 (v2023.03.01)
Mar 6, 2023	37.90% (0.37902)	97.94th	v2 (v2022.01.01)
May 16, 2022	37.90% (0.37902)	97.80th	v2 (v2022.01.01)
Mar 5, 2022	35.73% (0.35733)	96.97th	v2 (v2022.01.01)
Feb 4, 2022	34.03% (0.34034)	96.65th	v2 (v2022.01.01)

Weaknesses (1)

CWE-399

References (4)

http://secunia.com/advisories/60969
third-party-advisoryx_refsource_SECUNIA
http://www.securityfocus.com/bid/70351
vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1031021
vdb-entryx_refsource_SECTRACK
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-057
vendor-advisoryx_refsource_MS

Link	Providers	Tags
http://secunia.com/advisories/60969		third-party-advisoryx_refsource_SECUNIA
http://www.securityfocus.com/bid/70351		vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1031021		vdb-entryx_refsource_SECTRACK
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-057		vendor-advisoryx_refsource_MS

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner microsoft

Published Oct 15, 2014

Updated Aug 6, 2024

Reserved Jun 12, 2014

Link CVE-2014-4121

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2014-4121

Red Hat

Severity n/a

Public date n/a

Links CVE-2014-4121