The Universal Plug and Play (UPnP) service allows computers to discover and use network-based devices. Windows ME and XP include native UPnP services; Windows 98 and 98SE do not include a native UPnP service, but one can be installed via the Internet Connection Sharing client that ships with Windows XP. This bulletin discusses two vulnerabilities affecting these UPnP implementations. Although the vulnerabilities are unrelated, both involve how UPnP-capable computers handle the discovery of new devices on the network.

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