How severe is CVE-2000-0999?

CVE-2000-0999 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2000-0999 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2000-0999?

CVE-2000-0999 affects Openbsd Openssh. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2000-0999?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2000-0999 published?

CVE-2000-0999 was published on 2000-12-11 and last updated on 2026-06-16.

CVE-2000-0999

CVE-2000-0999 is a critical-severity vulnerability in Openbsd Openssh with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 12% (96th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Openbsd Openssh
Published: 2000-12-11
Last modified: 2026-06-16

Description

Format string vulnerabilities in OpenBSD ssh program (and possibly other BSD-based operating systems) allow attackers to gain root privileges.

Frequently asked questions

What is CVE-2000-0999?: Format string vulnerabilities in OpenBSD ssh program (and possibly other BSD-based operating systems) allow attackers to gain root privileges.
How severe is CVE-2000-0999?: CVE-2000-0999 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2000-0999 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2000-0999?: CVE-2000-0999 affects Openbsd Openssh. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2000-0999?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2000-0999 published?: CVE-2000-0999 was published on 2000-12-11 and last updated on 2026-06-16.

References

ftp://ftp.openbsd.org/pub/OpenBSD/patches/2.7/common/028_format_strings.patch

Affected products (1)

cpe:2.3:a:openbsd:openssh:4.5:*:*:*:*:*:*:*

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