rates different error messages when a valid username is provided versus an invalid name, which allows remote attackers to determine valid users on the system. NIST National Vulnerability Database (NVD) -- services.nvd.nist.gov (CVE / CVSS / CPE). {"cve":{"id":"CVE-1999-1266","sourceIdentifier":"cve@mitre.org","published":"1997-06-13T04:00:00.000","lastModified":"2026-06-16T21:50:04.320","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"rsh daemon (rshd) generates different error messages when a valid username is provided versus an invalid name, which allows remote attackers to determine valid users on the system."}],"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:N/A:N","baseScore":5.0,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"NONE","availabilityImpact":"NONE"},"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:a:metamail_corporation:metamail:*:*:*:*:*:*:*:*","versionEndIncluding":"7.2","matchCriteriaId":"CB6F8DFB-5EA4-4572-9BCF-5D0ECD56DB6C"}]}]}],"references":[{"url":"http://www.securityfocus.com/archive/1/6978","source":"cve@mitre.org","tags":["Vendor Advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/1660","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/archive/1/6978","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/1660","source":"af854a3a-2127-422b-91ae-364da2661108"}]}},