{"id":"CVE-1999-1021","title":"NFS on SunOS 4.1 through 4.1.2 ignores the high order 16 bits in a 32 bit UID, which allows a local user to gain root access if the lower 16 bits are set to 0, as fixed by the NFS jumbo patch upgrade.","summary":"NFS on SunOS 4.1 through 4.1.2 ignores the high order 16 bits in a 32 bit UID, which allows a local user to gain root access if the lower 16 bits are set to 0, as fixed by the NFS jumbo patch upgrade.","severity":"high","cvss":7.2,"cvssVector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","published":"1992-12-30","updated":"2026-06-16","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-1999-1021","references":[{"url":"http://sunsolve.sun.com/pub-cgi/retrieve.pl?doctype=coll&doc=secbull/117&type=0&nav=sec.sba","label":"cve@mitre.org"},{"url":"http://www.cert.org/advisories/CA-1992-15.html","label":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/47","label":"cve@mitre.org"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/82","label":"cve@mitre.org"},{"url":"http://sunsolve.sun.com/pub-cgi/retrieve.pl?doctype=coll&doc=secbull/117&type=0&nav=sec.sba","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.cert.org/advisories/CA-1992-15.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/47","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/82","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00411,"epssPercentile":0.3504,"ingestedAt":"2026-06-19T03:39:00.711Z","slug":"CVE-1999-1021","body":"## Overview\n\nNFS on SunOS 4.1 through 4.1.2 ignores the high order 16 bits in a 32 bit UID, which allows a local user to gain root access if the lower 16 bits are set to 0, as fixed by the NFS jumbo patch upgrade.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":39.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}