CVE-2008-5828: Microsoft Windows Live Messenger

Medium severity, CVSS 5.0. EPSS: 14.3% chance of exploitation in the next 30 days.

Microsoft Windows Live Messenger Client 8.5.1 and earlier, when MSN Protocol Version 15 (MSNP15) is used over a NAT session, allows remote attackers to discover intranet IP addresses and port numbers by reading the (1) IPv4InternalAddrsAndPorts, (2) IPv4Internal-Addrs, and (3) IPv4Internal-Port header fields.

Affected products

• Microsoft Windows Live Messenger: up to and including 8.5.1; version 8.0 only; version 8.1 only; version 8.5 only

Published 2009-01-02. Last modified 2026-06-16.