Which products and versions are affected by CVE-2014-0257?

Affected: .net Framework (Microsoft) versions 1.0-sp3, 1.1-sp1, 2.0-sp2, 3.5, 3.5.1, 4.0, 4.5, 4.5.1. The full list is in the CVE brief.

Is CVE-2014-0257 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2014-0257 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2014-0257?

Public exploit code is available.

Is there a fix for CVE-2014-0257?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2014-0257 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2014-0257

CriticalPublic exploit

Microsoft .NET Framework 1.0 SP3, 1.1 SP1, 2.0 SP2, 3.5, 3.5.1, 4, 4.5, and 4.5.1 does not properly determine whether it is safe to execute a method, which allows remote attackers to execute arbitrary code via (1) a crafted web site or (2) a crafted .NET Framework application…

Published Feb 12, 2014 · Updated Apr 28, 2026

Key Facts

Patch immediately

CVE-2014-0257 is a critical-severity vulnerability (CVSS 9.3 v2) affecting .net Framework (Microsoft).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 70% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

9.3

AV:N/AC:M/Au:N/C:C/I:C/A:C

EPSS (30-day exploit likelihood)

70%

Higher than 99.3% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2014-0257 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Affected Products

8 affected entries in total

Product	Affected versions	Fixed in
.net FrameworkMicrosoft	1.0-sp3, 1.1-sp1, 2.0-sp2, 3.5, 3.5.1, 4.0, 4.5, 4.5.1	n/a

Timeline

Publicly disclosed
Feb 12, 2014
Last updated
Apr 28, 2026

Weakness Type

CWE-20 Improper Input Validation

References

exploitMSF ms14_009_ie_dfsvc.rb
exploitExploitDB-33892
otherhttp://packetstormsecurity.com/files/127246/MS14-009-.NET-Deployment-Service-IE-Sandbox-Escape.html
otherMS14-009
other56793

4 more references in the full CVE brief

FAQ

Common Questions.

Microsoft .NET Framework 1.0 SP3, 1.1 SP1, 2.0 SP2, 3.5, 3.5.1, 4, 4.5, and 4.5.1 does not properly determine whether it is safe to execute a method, which allows remote attackers to execute arbitrary code via (1) a crafted web site or (2) a crafted .NET Framework application that exposes a COM server endpoint, aka "T…
Affected: .net Framework (Microsoft) versions 1.0-sp3, 1.1-sp1, 2.0-sp2, 3.5, 3.5.1, 4.0, 4.5, 4.5.1. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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