{"cve":"CVE-2009-1926","nvd":{"published":"2009-09-08T22:30:00.390","modified":"2026-06-16T23:08:22.480","status":"Modified","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_v4":null,"cvss_v3":null,"cwes":[],"references":["http://osvdb.org/57797","http://www.recurity-labs.com/content/pub/Microsoft_Windows_CVE-2009-1926","http://www.securityfocus.com/archive/1/506331/100/0/threaded","http://www.securityfocus.com/bid/36269","http://www.us-cert.gov/cas/techalerts/TA09-251A.html"],"products":["microsoft:windows_2000","microsoft:windows_server_2003","microsoft:windows_server_2008","microsoft:windows_vista","microsoft:windows_xp"],"source":"nvd","synced_at":"2026-10-19T19:54:26.868835795+00:00"},"epss":{"cve":"CVE-2009-1926","score":0.35042,"percentile":0.98436,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}