# Unauthenticated Command Injection via DHCP Option Handling in Multiple TP-Link Routers

CVE record · `CVE-2026-11834`

- **Identifiers:** `CVE-2026-11834`
- **State:** Confirmed
- **Severity:** CVSS 8.7 High
- **Critical:** No
- **CNA:** TPLink
- **Weakness (CWE):** [CWE-78](https://cwe.mitre.org/data/definitions/78.html)
- **Tags:** [Command injection](https://agentprime.io/advisories/tag/command-injection.md)
- **Technologies:** [TP-Link Systems Inc. Archer MR200 v07](https://agentprime.io/advisories/technology/tp-link-systems-inc-archer-mr200-v07.md) · [TP-Link Systems Inc. Archer MR200 v8](https://agentprime.io/advisories/technology/tp-link-systems-inc-archer-mr200-v8.md) · [TP Link Systems Inc. Archer MR402 v1](https://agentprime.io/advisories/technology/tp-link-systems-inc-archer-mr402-v1.md) · [TP-Link Systems Inc. Archer VR2100 v1](https://agentprime.io/advisories/technology/tp-link-systems-inc-archer-vr2100-v1.md) · [TP-Link Systems Inc. Archer C20 v5](https://agentprime.io/advisories/technology/tp-link-systems-inc-archer-c20-v5.md) · [TP-Link Systems Inc. Archer C20 v6](https://agentprime.io/advisories/technology/tp-link-systems-inc-archer-c20-v6.md) · [TP-Link Systems Inc. TL-MR6400 v7](https://agentprime.io/advisories/technology/tp-link-systems-inc-tl-mr6400-v7.md)
- **Published:** 22 Jun 2026
- **Updated:** 26 Jun 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: TPLink) at 22 Jun 2026, 17:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: TP-Link Systems Inc.. Product: Archer MR200 v07.
  - affected: `before 1.3.0 Build 250605` (custom)
  - Other versions: unaffected
- Vendor: TP-Link Systems Inc.. Product: Archer MR200 v8.
  - affected: `before 1.5.0 Build 260605` (custom)
  - Other versions: unaffected
- Vendor: TP Link Systems Inc.. Product: Archer MR402 v1.
  - affected: `before 1.5.0 Build 260605` (custom)
  - Other versions: unaffected
- Vendor: TP-Link Systems Inc.. Product: Archer VR2100 v1.
  - affected: `before EU_V1_260330` (custom)
  - Other versions: unaffected
- Vendor: TP-Link Systems Inc.. Product: Archer C20 v5.
  - affected: `before EU_V5_260317` (custom)
  - affected: `before US_V5_260419` (custom)
  - Other versions: unaffected
- Vendor: TP-Link Systems Inc.. Product: Archer C20 v6.
  - affected: `before V6_260608` (custom)
  - Other versions: unaffected
- Vendor: TP-Link Systems Inc.. Product: TL-MR6400 v7.
  - affected: `before 1.7.0 Build 260413` (custom)
  - Other versions: unaffected

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 8.7 High, CVSS 4.0: `CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`, from CNA (TPLink)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0066, the 52nd percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 22 Jun 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-11834](https://www.cve.org/CVERecord?id=CVE-2026-11834)
- [NVD: CVE-2026-11834](https://nvd.nist.gov/vuln/detail/CVE-2026-11834)

### References from the CNA

- <https://www.tp-link.com/en/support/download/archer-c20/> (patch)
- <https://www.tp-link.com/en/support/download/archer-mr402/#Firmware> (patch)
- <https://www.tp-link.com/en/support/download/archer-mr200/#Firmware> (patch)
- <https://www.tp-link.com/en/support/download/tl-mr6400/v7/#Firmware> (patch)
- <https://www.tp-link.com/en/support/download/archer-vr2100/#Firmware> (patch)
- <https://www.tp-link.com/us/support/download/archer-c20/> (patch)
- <https://www.tp-link.com/us/support/faq/5141/> (vendor-advisory)
- <https://mattg.systems/posts/cve-2026-11834/>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-11834>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-11834/>. Everything for agents: <https://agentprime.io/llms.txt>.