How severe is CVE-1999-0224?

CVE-1999-0224 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-1999-0224 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0224?

CVE-1999-0224 primarily affects Microsoft Windows Nt. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0224?

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

When was CVE-1999-0224 published?

CVE-1999-0224 was published on 1999-07-23 and last updated on 2026-06-16.

CVE-1999-0224

CVE-1999-0224 is a medium-severity vulnerability in Microsoft Windows Nt with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 17% places it in the 97th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 17% (97th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Windows Nt
Published: 1999-07-23
Last modified: 2026-06-16

Description

Denial of service in Windows NT messenger service through a long username.

Frequently asked questions

What is CVE-1999-0224?: Denial of service in Windows NT messenger service through a long username.
How severe is CVE-1999-0224?: CVE-1999-0224 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-1999-0224 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0224?: CVE-1999-0224 primarily affects Microsoft Windows Nt. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0224?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-0224 published?: CVE-1999-0224 was published on 1999-07-23 and last updated on 2026-06-16.

References

https://www.cve.org/CVERecord?id=CVE-1999-0224

Affected products (6)

cpe:2.3:o:microsoft:windows_nt:4.0:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp1:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp3:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp4:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp5:*:*:*:*:*:*

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