{"api_version":"1","generated_at":"2026-07-23T09:41:24+00:00","cve":"CVE-2009-1926","urls":{"html":"https://cve.report/CVE-2009-1926","api":"https://cve.report/api/cve/CVE-2009-1926.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2009-1926","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2009-1926"},"summary":{"title":"CVE-2009-1926","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.\"","state":"PUBLISHED","assigner":"microsoft","published_at":"2009-09-08 22:30:00","updated_at":"2026-04-23 00:35:47"},"problem_types":["NVD-CWE-Other","n/a"],"metrics":[{"version":"2.0","source":"nvd@nist.gov","type":"Primary","score":"7.8","severity":"","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","data":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:C","baseScore":7.8,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"COMPLETE"}}],"references":[{"url":"http://www.us-cert.gov/cas/techalerts/TA09-251A.html","name":"http://www.us-cert.gov/cas/techalerts/TA09-251A.html","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["US Government Resource"],"title":"US-CERT Technical Cyber Security Alert TA09-251A -- Microsoft Updates for Multiple Vulnerabilities","mime":"text/xml","httpstatus":"200","archivestatus":"200"},{"url":"http://osvdb.org/57797","name":"http://osvdb.org/57797","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"","mime":"","httpstatus":"-1","archivestatus":"0"},{"url":"http://www.securityfocus.com/bid/36269","name":"http://www.securityfocus.com/bid/36269","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"Microsoft Windows TCP/IP Orphaned Connection Remote Denial of Service Vulnerability","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"http://www.securityfocus.com/archive/1/506331/100/0/threaded","name":"http://www.securityfocus.com/archive/1/506331/100/0/threaded","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"SecurityFocus","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://www.recurity-labs.com/content/pub/Microsoft_Windows_CVE-2009-1926","name":"http://www.recurity-labs.com/content/pub/Microsoft_Windows_CVE-2009-1926","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"Error 404 - Not found","mime":"text/html","httpstatus":"404","archivestatus":"404"},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5965","name":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5965","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"Repository  /  Oval Repository","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-048","name":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-048","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"Microsoft Security Bulletin MS09-048 - Critical | Microsoft Docs","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2009-1926","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-1926","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"n/a","product":"n/a","version":"affected n/a","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_2000","cpe6":"-","cpe7":"sp4","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_server_2003","cpe6":"*","cpe7":"sp2","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_server_2008","cpe6":"*","cpe7":"*","cpe8":"itanium","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_server_2008","cpe6":"-","cpe7":"-","cpe8":"x32","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_server_2008","cpe6":"-","cpe7":"-","cpe8":"x64","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_server_2008","cpe6":"-","cpe7":"sp2","cpe8":"itanium","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_server_2008","cpe6":"-","cpe7":"sp2","cpe8":"x64","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_server_2008","cpe6":"-","cpe7":"sp2","cpe8":"x86","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_vista","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_vista","cpe6":"*","cpe7":"sp1","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_vista","cpe6":"*","cpe7":"sp2","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_vista","cpe6":"-","cpe7":"-","cpe8":"x64","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_vista","cpe6":"-","cpe7":"sp1","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_vista","cpe6":"-","cpe7":"sp2","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_xp","cpe6":"*","cpe7":"sp2","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_xp","cpe6":"*","cpe7":"sp2","cpe8":"professional","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2009","cve_id":"1926","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"microsoft","cpe5":"windows_xp","cpe6":"*","cpe7":"sp3","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"providerMetadata":{"dateUpdated":"2024-08-07T05:27:54.788Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"name":"oval:org.mitre.oval:def:5965","tags":["vdb-entry","signature","x_refsource_OVAL","x_transferred"],"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5965"},{"tags":["x_refsource_MISC","x_transferred"],"url":"http://www.recurity-labs.com/content/pub/Microsoft_Windows_CVE-2009-1926"},{"name":"36269","tags":["vdb-entry","x_refsource_BID","x_transferred"],"url":"http://www.securityfocus.com/bid/36269"},{"name":"57797","tags":["vdb-entry","x_refsource_OSVDB","x_transferred"],"url":"http://osvdb.org/57797"},{"name":"TA09-251A","tags":["third-party-advisory","x_refsource_CERT","x_transferred"],"url":"http://www.us-cert.gov/cas/techalerts/TA09-251A.html"},{"name":"MS09-048","tags":["vendor-advisory","x_refsource_MS","x_transferred"],"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-048"},{"name":"20090909 TCP/IP Orphaned Connections Vulnerability","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"],"url":"http://www.securityfocus.com/archive/1/506331/100/0/threaded"}],"title":"CVE Program Container"},{"metrics":[{"other":{"content":{"id":"CVE-2009-1926","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2024-01-11T16:45:37.416398Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2024-10-17T18:29:15.515Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}]}],"datePublic":"2009-09-08T00:00:00.000Z","descriptions":[{"lang":"en","value":"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.\""}],"problemTypes":[{"descriptions":[{"description":"n/a","lang":"en","type":"text"}]}],"providerMetadata":{"dateUpdated":"2018-10-12T19:57:01.000Z","orgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","shortName":"microsoft"},"references":[{"name":"oval:org.mitre.oval:def:5965","tags":["vdb-entry","signature","x_refsource_OVAL"],"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5965"},{"tags":["x_refsource_MISC"],"url":"http://www.recurity-labs.com/content/pub/Microsoft_Windows_CVE-2009-1926"},{"name":"36269","tags":["vdb-entry","x_refsource_BID"],"url":"http://www.securityfocus.com/bid/36269"},{"name":"57797","tags":["vdb-entry","x_refsource_OSVDB"],"url":"http://osvdb.org/57797"},{"name":"TA09-251A","tags":["third-party-advisory","x_refsource_CERT"],"url":"http://www.us-cert.gov/cas/techalerts/TA09-251A.html"},{"name":"MS09-048","tags":["vendor-advisory","x_refsource_MS"],"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-048"},{"name":"20090909 TCP/IP Orphaned Connections Vulnerability","tags":["mailing-list","x_refsource_BUGTRAQ"],"url":"http://www.securityfocus.com/archive/1/506331/100/0/threaded"}],"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"secure@microsoft.com","ID":"CVE-2009-1926","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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.\""}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"name":"oval:org.mitre.oval:def:5965","refsource":"OVAL","url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5965"},{"name":"http://www.recurity-labs.com/content/pub/Microsoft_Windows_CVE-2009-1926","refsource":"MISC","url":"http://www.recurity-labs.com/content/pub/Microsoft_Windows_CVE-2009-1926"},{"name":"36269","refsource":"BID","url":"http://www.securityfocus.com/bid/36269"},{"name":"57797","refsource":"OSVDB","url":"http://osvdb.org/57797"},{"name":"TA09-251A","refsource":"CERT","url":"http://www.us-cert.gov/cas/techalerts/TA09-251A.html"},{"name":"MS09-048","refsource":"MS","url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-048"},{"name":"20090909 TCP/IP Orphaned Connections Vulnerability","refsource":"BUGTRAQ","url":"http://www.securityfocus.com/archive/1/506331/100/0/threaded"}]}}}},"cveMetadata":{"assignerOrgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","assignerShortName":"microsoft","cveId":"CVE-2009-1926","datePublished":"2009-09-08T22:00:00.000Z","dateReserved":"2009-06-04T00:00:00.000Z","dateUpdated":"2024-10-17T18:29:15.515Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"},"nvd":{"publishedDate":"2009-09-08 22:30:00","lastModifiedDate":"2026-04-23 00:35:47","problem_types":["NVD-CWE-Other","n/a"],"metrics":{"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:C","baseScore":7.8,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"COMPLETE"},"baseSeverity":"HIGH","exploitabilityScore":10,"impactScore":6.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_2000:-:sp4:*:*:*:*:*:*","matchCriteriaId":"CA2CBE65-F4B6-49AF-983C-D3CF6C172CC5"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_server_2003:*:sp2:*:*:*:*:*:*","matchCriteriaId":"4D3B5E4F-56A6-4696-BBB4-19DF3613D020"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_server_2008:*:*:itanium:*:*:*:*:*","matchCriteriaId":"7F6EA111-A4E6-4963-A0C8-F9336C605B6E"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_server_2008:-:-:x32:*:*:*:*:*","matchCriteriaId":"26A548AB-7C40-4CB7-B024-8A2DA947F245"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_server_2008:-:-:x64:*:*:*:*:*","matchCriteriaId":"5BE99796-BADE-40D1-AD85-03D28A466E5F"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_server_2008:-:sp2:itanium:*:*:*:*:*","matchCriteriaId":"7AE15F6C-80F6-43A6-86DA-B92116A697A0"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_server_2008:-:sp2:x64:*:*:*:*:*","matchCriteriaId":"2C9B0563-D613-497D-8F2E-515E6DA00CA5"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_server_2008:-:sp2:x86:*:*:*:*:*","matchCriteriaId":"BA99C751-91CB-43D4-93FF-1C12342CAF1E"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_vista:*:*:*:*:*:*:*:*","matchCriteriaId":"3852BB02-47A1-40B3-8E32-8D8891A53114"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_vista:*:sp1:*:*:*:*:*:*","matchCriteriaId":"C162FFF0-1E8F-4DCF-A08F-6C6E324ED878"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_vista:*:sp2:*:*:*:*:*:*","matchCriteriaId":"0A0D2704-C058-420B-B368-372D1129E914"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_vista:-:-:x64:*:*:*:*:*","matchCriteriaId":"CD560746-0AED-4646-934E-6742888FB6F2"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_vista:-:sp1:*:*:*:*:*:*","matchCriteriaId":"3A04E39A-623E-45CA-A5FC-25DAA0F275A3"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_vista:-:sp2:*:*:*:*:*:*","matchCriteriaId":"BF1AD1A1-EE20-4BCE-9EE6-84B27139811C"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_xp:*:sp2:*:*:*:*:*:*","matchCriteriaId":"9B339C33-8896-4896-88FF-88E74FDBC543"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_xp:*:sp2:professional:*:*:*:*:*","matchCriteriaId":"C29F02ED-85FC-4D22-A6DE-5F9C77ECCD70"},{"vulnerable":true,"criteria":"cpe:2.3:o:microsoft:windows_xp:*:sp3:*:*:*:*:*:*","matchCriteriaId":"CE477A73-4EE4-41E9-8694-5A3D5DC88656"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2009","CveId":"1926","Ordinal":"1","Title":"CVE-2009-1926","CVE":"CVE-2009-1926","Year":"2009"},"notes":[{"CveYear":"2009","CveId":"1926","Ordinal":"1","NoteData":"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.\"","Type":"Description","Title":"CVE-2009-1926"},{"CveYear":"2009","CveId":"1926","Ordinal":"2","NoteData":"2009-09-08","Type":"Other","Title":"Published"},{"CveYear":"2009","CveId":"1926","Ordinal":"3","NoteData":"2018-10-12","Type":"Other","Title":"Modified"}]}}}