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TP-Link Kasa smart home devices HS103P3 and HS103P4 v5 have insufficient cryptographic protections in their local communication protocol. This weakness allows an adjacent network attacker to intercept, replay, or forge control messages. Exploitation can lead to unauthorized control of the device, causing state changes, disruption, or denial of service.

CVE-2026-76784 describes a vulnerability in TP-Link Systems Inc. Kasa smart home devices HS103P3 and HS103P4 version 5, where the local device communication protocol lacks adequate cryptographic protections (CWE-325). This deficiency enables an attacker on the same network segment to intercept, replay, or forge control messages exchanged locally. Successful exploitation may allow unauthorized manipulation of device operational states, potentially disrupting normal functionality or causing denial-of-service conditions. The CVSS 4.0 score is 8.7 (high severity), reflecting the ease of attack and high impact on confidentiality, integrity, and availability. No patch or official remediation has been disclosed as of the publication date.

Detailed information about CVE-2026-76784: CWE-325: Missing Cryptographic Step in TP-Link Systems Inc. HS103P3 / HS103P4 v5 affecting TP-Link Systems Inc. HS103

CVE-2026-76784: CWE-325: Missing Cryptographic Step in TP-Link Systems Inc. HS103P3 / HS103P4 v5 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-76784: CWE-325: Missing Cryptographic Step in TP-Link Systems Inc. HS103P3 / HS103P4 v5

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