How severe is CVE-1999-1127?

CVE-1999-1127 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-1999-1127 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1127?

CVE-1999-1127 primarily affects Microsoft Windows Nt. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-1127?

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-1999-1127 published?

CVE-1999-1127 was published on 1999-12-31 and last updated on 2026-06-16.

CVE-1999-1127

CVE-1999-1127 is a high-severity vulnerability in Microsoft Windows Nt with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 18% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-772.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 18% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-772
Affected product: Microsoft Windows Nt
Published: 1999-12-31
Last modified: 2026-06-16

Description

Windows NT 4.0 does not properly shut down invalid named pipe RPC connections, which allows remote attackers to cause a denial of service (resource exhaustion) via a series of connections containing malformed data, aka the "Named Pipes Over RPC" vulnerability.

Frequently asked questions

What is CVE-1999-1127?: Windows NT 4.0 does not properly shut down invalid named pipe RPC connections, which allows remote attackers to cause a denial of service (resource exhaustion) via a series of connections containing malformed data, aka the "Named Pipes Over RPC" vulnerability.
How severe is CVE-1999-1127?: CVE-1999-1127 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-1999-1127 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1127?: CVE-1999-1127 primarily affects Microsoft Windows Nt. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-1127?: 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-1999-1127 published?: CVE-1999-1127 was published on 1999-12-31 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:o:microsoft:windows_nt:4.0:-:*:*:enterprise:*:*:*
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:*:*:*

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