CVE-2001-0877

Windows 98 vulnerability

CVSS

5.0

EPSS

43.8%

EPSS pct

99th

Exploited

No known

Universal Plug and Play (UPnP) on Windows 98, 98SE, ME, and XP allows remote attackers to cause a denial of service via (1) a spoofed SSDP advertisement that causes the client to connect to a service on another machine that generates a large amount of traffic (e.g., chargen), or (2) via a spoofed SSDP announcement to broadcast or multicast addresses, which could cause all UPnP clients to send traffic to a single target system.

Affected vendor

Microsoft

Affected product

Windows 98

CVSS vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Published

2001-12-20

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to availability.

Its EPSS score of 43.8% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it among the most exploited CVEs currently tracked.

Check your external exposure to CVE-2001-0877

Confirm whether Microsoft Windows 98 is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2001-0877.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2001-0877

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2001-0877 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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