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Vulnerability record · CVE-2014-0253 · published 12 February 2014

CVE-2014-0253: Microsoft .net framework improper input validation vulnerability

Microsoft · .Net Framework

Microsoft .NET Framework 1.1 SP1, 2.0 SP2, 3.5, 3.5.1, 4, 4.5, and 4.5.1 does not properly determine TCP connection states, which allows remote attackers to cause a denial of service (ASP.NET daemon hang) via crafted HTTP requests that trigger persistent resource consumption for a (1) stale or (2) closed connection, as exploited in the wild in February 2014, aka "POST Request DoS Vulnerability."

5.0 CVSS 2.0 Medium EPSS 39% · top 1.5% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

Microsoft .NET Framework 1.1 SP1, 2.0 SP2, 3.5, 3.5.1, 4, 4.5, and 4.5.1 does not properly determine TCP connection states, which allows remote attackers to cause a denial of service (ASP.NET daemon hang) via crafted HTTP requests that trigger persistent resource consumption for a (1) stale or (2) closed connection, as exploited in the wild in February 2014, aka "POST Request DoS Vulnerability."

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://osvdb.org/103162
http://secunia.com/advisories/56793
http://www.securityfocus.com/bid/65415
http://www.securitytracker.com/id/1029745
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-009
http://osvdb.org/103162
http://secunia.com/advisories/56793
http://www.securityfocus.com/bid/65415
http://www.securitytracker.com/id/1029745
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-009

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2014-0253), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.