How severe is CVE-1999-0656?

CVE-1999-0656 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-1999-0656 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0656?

CVE-1999-0656 affects Linux Linux Kernel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-0656?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-1999-0656 published?

CVE-1999-0656 was published on 1999-01-01 and last updated on 2026-06-16.

CVE-1999-0656

CVE-1999-0656 is a medium-severity vulnerability in Linux Linux Kernel with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-16.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-16
Affected product: Linux Linux Kernel
Published: 1999-01-01
Last modified: 2026-06-16

Description

The ugidd RPC interface, by design, allows remote attackers to enumerate valid usernames by specifying arbitrary UIDs that ugidd maps to local user and group names.

Frequently asked questions

What is CVE-1999-0656?: The ugidd RPC interface, by design, allows remote attackers to enumerate valid usernames by specifying arbitrary UIDs that ugidd maps to local user and group names.
How severe is CVE-1999-0656?: CVE-1999-0656 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-1999-0656 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0656?: CVE-1999-0656 affects Linux Linux Kernel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-0656?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-0656 published?: CVE-1999-0656 was published on 1999-01-01 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

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