Is CVE-2014-0253 in the CISA KEV catalog?

No. CVE-2014-0253 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2014-0253?

CVE-2014-0253 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2014-0253?

CVE-2014-0253 has an EPSS score of 38.70% (98th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2014-0253

MEDIUMEPSS 98th pctl

5.0

CVSS v2

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."

CWE-20Improper Input Validation

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

38.70%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.