an attacker sends many SYN packets to create multiple connections without ever sending an ACK to complete the connection, aka SYN flood. NIST National Vulnerability Database (NVD) -- services.nvd.nist.gov (CVE / CVSS / CPE). {"cve":{"id":"CVE-1999-0116","sourceIdentifier":"cve@mitre.org","published":"1996-09-19T04:00:00.000","lastModified":"2026-06-16T21:47:37.367","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"Denial of service when an attacker sends many SYN packets to create multiple connections without ever sending an ACK to complete the connection, aka SYN flood."}],"affected":[{"source":"cve@mitre.org","affectedData":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]}],"metrics":{"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P","baseScore":5.0,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL"},"baseSeverity":"MEDIUM","exploitabilityScore":10.0,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"NVD-CWE-Other"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:ibm:aix:3.2.5:*:*:*:*:*:*:*","matchCriteriaId":"D3C00FC9-AD97-4226-A0EA-7DB14AA592DE"},{"vulnerable":true,"criteria":"cpe:2.3:o:ibm:aix:4.1:*:*:*:*:*:*:*","matchCriteriaId":"FBF25306-E7C2-4F9A-A809-4779A6C0A079"},{"vulnerable":true,"criteria":"cpe:2.3:o:ibm:aix:4.2:*:*:*:*:*:*:*","matchCriteriaId":"05F20EC2-ADE6-4F96-A2E7-1DCCA819D657"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:h:ibm:sng:2.1:*:*:*:*:*:*:*","matchCriteriaId":"6FAC4577-5CC1-4099-8CBE-8AD5C1AF3807"},{"vulnerable":true,"criteria":"cpe:2.3:h:ibm:sng:2.2:*:*:*:*:*:*:*","matchCriteriaId":"E223FC83-3079-4EB8-940F-5546DCD6F473"}]}]}],"references":[{"url":"ftp://patches.sgi.com/support/free/security/advisories/19961202-01-PX","source":"cve@mitre.org"},{"url":"http://sunsolve.sun.com/pub-cgi/retrieve.pl?doctype=coll&doc=secbull/136","source":"cve@mitre.org"},{"url":"ftp://patches.sgi.com/support/free/security/advisories/19961202-01-PX","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://sunsolve.sun.com/pub-cgi/retrieve.pl?doctype=coll&doc=secbull/136","source":"af854a3a-2127-422b-91ae-364da2661108"}]}},