How severe is CVE-1999-0077?

CVE-1999-0077 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-1999-0077 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 31% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0077?

CVE-1999-0077 affects Microsoft Windows Nt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-0077?

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

When was CVE-1999-0077 published?

CVE-1999-0077 was published on 1995-01-01 and last updated on 2026-06-16.

CVE-1999-0077

CVE-1999-0077 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 31% places it in the 98th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 31% (98th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Windows Nt
Published: 1995-01-01
Last modified: 2026-06-16

Description

Predictable TCP sequence numbers allow spoofing.

Frequently asked questions

What is CVE-1999-0077?: Predictable TCP sequence numbers allow spoofing.
How severe is CVE-1999-0077?: CVE-1999-0077 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-1999-0077 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 31% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0077?: CVE-1999-0077 affects Microsoft Windows Nt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-0077?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-0077 published?: CVE-1999-0077 was published on 1995-01-01 and last updated on 2026-06-16.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/139

Affected products (1)

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

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