Cross-site request forgery (CSRF) vulnerability in the xslt script in the web-based management interface on the 2wire 1701HG, 1800HW, 2071HG, and 2700HG with firmware 3.17.5, 3.7.1, 4.25.19, or 5.29.51 allows remote attackers to hijack the intranet connectivity of arbitrary users for requests that cause a denial of service (network outage) via a page parameter with a % (percent) character followed by a non-alphanumeric character.