CVE-2026-9770 | Kasa EC71 v4 and EC70 v4 firmware contains a static cryptogr… | CVSS 8.6 HIGH

Description

Kasa EC71 v4 and EC70 v4 firmware contains a static cryptographic private key stored in a read-only filesystem that is shared across devices. An attacker with access to the firmware image can extract the embedded key. Successful exploitation may allow an unauthenticated attacker on the same network to use this key in the web management service, compromising the confidentiality of encrypted communications. This may enable passive decryption of traffic or active man-in-the-middle (MITM) attacks

Metadata

CVE ID: CVE-2026-9770
State: PUBLISHED
Assigner: TPLink
Reserved: 2026-05-27 22:00 UTC
Published: 2026-07-15 00:21 UTC
Last updated: 2026-07-15 00:21 UTC
Primary CWE: CWE-321
CWE-321 Use of hard-coded cryptographic key
Vendor / Product: TP-Link Systems Inc. / Kasa EC71 v4
Sources: cve.org · NVD

Severity & Metrics

8.6 HIGH CVSS 4.0

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Affected products (2)

Vendor	Product	Platform	Versions
TP-Link Systems Inc.	Kasa EC70 v4	—	0 < 2.4.0 Build 20260520 rel.4191
TP-Link Systems Inc.	Kasa EC71 v4	—	0 < 2.4.0 Build 20260520 rel.4191

Weakness (CWE)

CWE	Source	Description
CWE-321	cna	CWE-321 Use of hard-coded cryptographic key

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.6	HIGH	4.0	cna	CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References (5)