CVE-1999-1021: Sun Sunos

High severity, CVSS 7.2. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Sun Sunos: version 4.1 only; version 4.1.1 only; version 4.1.2 only

Published 1992-12-30. Last modified 2026-06-16.