Is CVE-2009-1926 in the CISA KEV catalog?

No. CVE-2009-1926 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-1926?

CVE-2009-1926 has a CVSS v2 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2009-1926?

CVE-2009-1926 has an EPSS score of 35.04% (98th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2009-1926

HIGHEPSS 98th pctl

7.8

CVSS v2

NVD

Description

Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 Gold and SP2 allow remote attackers to cause a denial of service (TCP outage) via a series of TCP sessions that have pending data and a (1) small or (2) zero receive window size, and remain in the FIN-WAIT-1 or FIN-WAIT-2 state indefinitely, aka "TCP/IP Orphaned Connections Vulnerability."

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

35.04%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 2026-04-23.