CVE-2026-9770: Hardcoded Cryptographic Key Information Disclosure Vulnerability on TP-Link Kasa EC70 and EC71

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-15 · updated 2026-08-06
Weakness: CWE-321

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

Affected products

TP-Link Kasa Ec70 Firmware: before 2.4.0 — fixed in 2.4.0
TP-Link Kasa Ec71 Firmware: before 2.4.0 — fixed in 2.4.0

How to fix

Upgrade to a fixed version: TP-Link Kasa Ec70 Firmware 2.4.0; TP-Link Kasa Ec71 Firmware 2.4.0. Check the vendor advisory for mitigations.

References

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