mail servers including Ipswitch, Mdaemon, and Exchange through a buffer overflow in the SMTP HELO command. NIST National Vulnerability Database (NVD) -- services.nvd.nist.gov (CVE / CVSS / CPE). {"cve":{"id":"CVE-1999-0284","sourceIdentifier":"cve@mitre.org","published":"1998-01-01T05:00:00.000","lastModified":"2026-06-16T21:48:04.237","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"Denial of service to NT mail servers including Ipswitch, Mdaemon, and Exchange through a buffer overflow in the SMTP HELO command."}],"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:P/I:P/A:P","baseScore":7.5,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL"},"baseSeverity":"HIGH","exploitabilityScore":10.0,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":true,"userInteractionRequired":false}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-120"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:ibm:lotus_domino_mail_server:*:*:*:*:*:*:*:*","matchCriteriaId":"42E18F8C-4D45-4404-9DC0-8DDF24E18282"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:exchange_server:4.0:-:*:*:*:*:*:*","matchCriteriaId":"1122C21D-C67C-4702-A084-A0DFBA03A761"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:exchange_server:5.0:-:*:*:*:*:*:*","matchCriteriaId":"D823C88E-8560-469B-8655-4755E0484F14"}]}]}],"references":[{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0284","source":"cve@mitre.org"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0284","source":"af854a3a-2127-422b-91ae-364da2661108"}]}},