Medium · CVSS 5.4CVE-2026-102370

Physical UART Access Leading to an Unauthenticated Root Shell in TP-Link Kasa EC70 and EC71

Answer in brief

CVE-2026-102370 records a Medium severity (CVSS 5.4) vulnerability in Physical UART Access Leading to an Unauthenticated Root Shell in TP-Link Kasa EC70 and EC71. The current sources do not mark it as known exploited. The current feed maps TP-Link Systems Inc./Kasa EC70 V4 (generic), TP-Link Systems Inc./Kasa EC71 V4 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.4
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps TP-Link Systems Inc./Kasa EC70 V4 (generic), TP-Link Systems Inc./Kasa EC71 V4 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
TP-Link Systems Inc./Kasa EC70 V4generic	>=0 <2.4.3 Build 20260902 rel.4511	2.4.3 Build 20260902 rel.4511, 2.4.3
TP-Link Systems Inc./Kasa EC71 V4generic	>=0 <2.4.3 Build 20260902 rel.4511	2.4.3 Build 20260902 rel.4511, 2.4.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for TP-Link Systems Inc./Kasa EC70 V4, TP-Link Systems Inc./Kasa EC71 V4.
Review the reported fix. Update TP-Link Systems Inc./Kasa EC70 V4 to 2.4.3 Build 20260902 rel.4511; TP-Link Systems Inc./Kasa EC71 V4 to 2.4.3 Build 20260902 rel.4511 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.