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."

References

• https://nvd.nist.gov/vuln/detail/CVE-2014-0253
• 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