CVE-1999-1021

CVE-1999-1021 is a high-severity vulnerability in Sun Sunos with a CVSS 2.0 base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

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.

Frequently asked questions

What is CVE-1999-1021?
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.
How severe is CVE-1999-1021?
CVE-1999-1021 has a CVSS 2.0 base score of 7.2, rated high severity.
Is CVE-1999-1021 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1021?
CVE-1999-1021 primarily affects Sun Sunos. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-1021?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-1999-1021 published?
CVE-1999-1021 was published on 1992-12-30 and last updated on 2026-06-16.

References

Affected products (3)

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