CVE-2021-3125

Name: CVE-2021-3125
Creator: NVD / NIST
Published: 2021-04-12T19:15:14.753+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.50%

Last modified Jun 17, 2026

CVE-2021-3125 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 1.50% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.50%

71.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-834

Affected Software

Vendor	Product	Versions
Tp-Link	Tl-Xdr3230 Firmware	< 1.0.12
Tp-Link	Tl-Xdr5430 Firmware	< 1.0.11
Tp-Link	Tl-Xdr3250 Firmware	< 1.0.2
Tp-Link	Tl-Xdr1860 Firmware	< 1.0.14
Tp-Link	Tl-Xdr1850 Firmware	< 1.0.9
Tp-Link	Tl-Xdr6060 Firmware	< 1.1.8

References

https://service.tp-link.com.cn/detail_download_8719.htmlVendor Advisory
https://service.tp-link.com.cn/detail_download_8720.htmlVendor Advisory
https://service.tp-link.com.cn/detail_download_8722.htmlVendor Advisory
https://service.tp-link.com.cn/detail_download_8723.htmlVendor Advisory
https://service.tp-link.com.cn/detail_download_8724.htmlVendor Advisory
https://service.tp-link.com.cn/detail_download_8725.htmlVendor Advisory
https://service.tp-link.com.cn/detail_download_8719.htmlVendor Advisory
https://service.tp-link.com.cn/detail_download_8720.htmlVendor Advisory
https://service.tp-link.com.cn/detail_download_8722.htmlVendor Advisory
https://service.tp-link.com.cn/detail_download_8723.htmlVendor Advisory
https://service.tp-link.com.cn/detail_download_8724.htmlVendor Advisory
https://service.tp-link.com.cn/detail_download_8725.htmlVendor Advisory

Timeline

Published: Apr 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3125?

How severe is CVE-2021-3125?

CVE-2021-3125 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.50% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3125?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3125?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST