CVE-2021-3125: TP-Link Tl-XDR1850 Firmware

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

In TP-Link TL-XDR3230 < 1.0.12, TL-XDR1850 < 1.0.9, TL-XDR1860 < 1.0.14, TL-XDR3250 < 1.0.2, TL-XDR6060 Turbo < 1.1.8, TL-XDR5430 < 1.0.11, and possibly others, when IPv6 is used, a routing loop can occur that generates excessive network traffic between an affected device and its upstream ISP's router. This occurs when a link prefix route points to a point-to-point link, a destination IPv6 address belongs to the prefix and is not a local IPv6 address, and a router advertisement is received with at least one global unique IPv6 prefix for which the on-link flag is set.

Affected products

• TP-Link Tl-XDR1850 Firmware: before 1.0.9 (fixed in 1.0.9)
• TP-Link Tl-XDR1860 Firmware: before 1.0.14 (fixed in 1.0.14)
• TP-Link Tl-XDR3230 Firmware: before 1.0.12 (fixed in 1.0.12)
• TP-Link Tl-XDR3250 Firmware: before 1.0.2 (fixed in 1.0.2)
• TP-Link Tl-XDR5430 Firmware: before 1.0.11 (fixed in 1.0.11)
• TP-Link Tl-XDR6060 Firmware: before 1.1.8 (fixed in 1.1.8)

Published 2021-04-12. Last modified 2026-06-17.