CVE-2021-3275: TP-Link Archer-c3150 Firmware

Medium severity, CVSS 6.1. EPSS: 1.8% chance of exploitation in the next 30 days.

Unauthenticated stored cross-site scripting (XSS) exists in multiple TP-Link products including WIFI Routers (Wireless AC routers), Access Points, ADSL + DSL Gateways and Routers, which affects TD-W9977v1, TL-WA801NDv5, TL-WA801Nv6, TL-WA802Nv5, and Archer C3150v2 devices through the improper validation of the hostname. Some of the pages including dhcp.htm, networkMap.htm, dhcpClient.htm, qsEdit.htm, and qsReview.htm and use this vulnerable hostname function (setDefaultHostname()) without sanitization.

Affected products

• TP-Link Archer-c3150 Firmware: version v2_170926 only
• TP-Link Td-w9977 Firmware: version v1_0.1.0_0.9.1_up_boot(161123)_2016-11-23_15.36.15 only
• TP-Link Tl-WA801N Firmware: version v6_eu_0.9.1_3.16_up_boot[200116-rel61815] only
• TP-Link Tl-WA801ND Firmware: version v5_us_0.9.1_3.16_up_boot[170905-rel56404] only
• TP-Link Tl-WR802N Firmware: version v4_us_0.9.1_3.17_up_boot[200421-rel38950] only

Published 2021-03-26. Last modified 2026-06-17.