How severe is CVE-2000-1227?

CVE-2000-1227 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2000-1227 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2000-1227?

CVE-2000-1227 primarily affects Microsoft Windows 2000. In total, 32 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2000-1227?

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

When was CVE-2000-1227 published?

CVE-2000-1227 was published on 2000-12-31 and last updated on 2026-06-16.

CVE-2000-1227

CVE-2000-1227 is a medium-severity vulnerability in Microsoft Windows 2000 with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 13% (96th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Windows 2000
Published: 2000-12-31
Last modified: 2026-06-16

Description

Windows NT 4.0 and Windows 2000 hosts allow remote attackers to cause a denial of service (unavailable connections) by sending multiple SMB SMBnegprots requests but not reading the response that is sent back.

Frequently asked questions

What is CVE-2000-1227?: Windows NT 4.0 and Windows 2000 hosts allow remote attackers to cause a denial of service (unavailable connections) by sending multiple SMB SMBnegprots requests but not reading the response that is sent back.
How severe is CVE-2000-1227?: CVE-2000-1227 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2000-1227 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2000-1227?: CVE-2000-1227 primarily affects Microsoft Windows 2000. In total, 32 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2000-1227?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2000-1227 published?: CVE-2000-1227 was published on 2000-12-31 and last updated on 2026-06-16.

References

Affected products (32)

cpe:2.3:o:microsoft:windows_2000:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:*:enterprise_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:*:server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:*:terminal_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:*:workstation:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp1:enterprise_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp1:server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp1:terminal_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp1:workstation:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp2:enterprise_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp2:server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp2:terminal_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp2:workstation:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp3:enterprise_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp3:server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp3:terminal_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp3:workstation:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp4:enterprise_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp4:server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp4:terminal_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp4:workstation:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp5:enterprise_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp5:server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp5:terminal_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp5:workstation:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp6:enterprise_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp6:server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp6:terminal_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp6:workstation:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp6a:enterprise_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp6a:server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp6a:workstation:*:*:*:*:*

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