What’s Vulnerable › Vulnerabilities
CVE-2021-3125
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-04-12 · updated 2026-06-17
- Weakness: CWE-834
Description
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
How to fix
Upgrade to a fixed version: TP-Link Tl-Xdr1850 Firmware 1.0.9; TP-Link Tl-Xdr1860 Firmware 1.0.14; TP-Link Tl-Xdr3230 Firmware 1.0.12; TP-Link Tl-Xdr3250 Firmware 1.0.2; TP-Link Tl-Xdr5430 Firmware 1.0.11; TP-Link Tl-Xdr6060 Firmware 1.1.8. Check the vendor advisory for mitigations.
References
- https://service.tp-link.com.cn/detail_download_8719.html
- https://service.tp-link.com.cn/detail_download_8720.html
- https://service.tp-link.com.cn/detail_download_8722.html
- https://service.tp-link.com.cn/detail_download_8723.html
- https://service.tp-link.com.cn/detail_download_8724.html
- https://service.tp-link.com.cn/detail_download_8725.html
- https://service.tp-link.com.cn/detail_download_8719.html
- https://service.tp-link.com.cn/detail_download_8720.html
- https://service.tp-link.com.cn/detail_download_8722.html
- https://service.tp-link.com.cn/detail_download_8723.html
- https://service.tp-link.com.cn/detail_download_8724.html
- https://service.tp-link.com.cn/detail_download_8725.html
Get alerted when CVE-2021-3125 or the next vulnerability affects your stack