How severe is CVE-1999-1201?

CVE-1999-1201 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-1999-1201 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1201?

CVE-1999-1201 primarily affects Microsoft Windows 95. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-1201?

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

When was CVE-1999-1201 published?

CVE-1999-1201 was published on 1999-02-06 and last updated on 2026-06-16.

CVE-1999-1201

CVE-1999-1201 is a medium-severity vulnerability in Microsoft Windows 95 with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 14% 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: 14% (96th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Windows 95
Published: 1999-02-06
Last modified: 2026-06-16

Description

Windows 95 and Windows 98 systems, when configured with multiple TCP/IP stacks bound to the same MAC address, allow remote attackers to cause a denial of service (traffic amplification) via a certain ICMP echo (ping) packet, which causes all stacks to send a ping response, aka TCP Chorusing.

Frequently asked questions

What is CVE-1999-1201?: Windows 95 and Windows 98 systems, when configured with multiple TCP/IP stacks bound to the same MAC address, allow remote attackers to cause a denial of service (traffic amplification) via a certain ICMP echo (ping) packet, which causes all stacks to send a ping response, aka TCP Chorusing.
How severe is CVE-1999-1201?: CVE-1999-1201 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-1999-1201 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1201?: CVE-1999-1201 primarily affects Microsoft Windows 95. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-1201?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-1201 published?: CVE-1999-1201 was published on 1999-02-06 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:o:microsoft:windows_95:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_98:*:gold:*:*:*:*:*:*

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