How severe is CVE-2001-0721?

CVE-2001-0721 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2001-0721 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-2001-0721?

CVE-2001-0721 primarily affects Microsoft Windows 98. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2001-0721?

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

When was CVE-2001-0721 published?

CVE-2001-0721 was published on 2001-12-06 and last updated on 2026-06-16.

CVE-2001-0721

CVE-2001-0721 is a medium-severity vulnerability in Microsoft Windows 98 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 98
Published: 2001-12-06
Last modified: 2026-06-16

Description

Universal Plug and Play (UPnP) in Windows 98, 98SE, ME, and XP allows remote attackers to cause a denial of service (memory consumption or crash) via a malformed UPnP request.

Frequently asked questions

What is CVE-2001-0721?: Universal Plug and Play (UPnP) in Windows 98, 98SE, ME, and XP allows remote attackers to cause a denial of service (memory consumption or crash) via a malformed UPnP request.
How severe is CVE-2001-0721?: CVE-2001-0721 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2001-0721 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-2001-0721?: CVE-2001-0721 primarily affects Microsoft Windows 98. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2001-0721?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2001-0721 published?: CVE-2001-0721 was published on 2001-12-06 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:o:microsoft:windows_98:*:gold:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_98se:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_me:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:gold:*:*:*:*:*:*

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