TP-Link KL125 Local Device Communication Protocol authentication replay

Summaryinfo

A vulnerability, which was classified as critical, was found in TP-Link HS103P3, HS103P4 v5, EP10, EP25 V2, HS300 V2, KP303 V2, EP40A, KP125MP2, KP125MP4, KP115, KS225, EP40M, KS205, KS240, ES20M, KS220M, KP200 V3, HS200 V5.26, HS220-LA 6.6, HS220-BL 6.6, HS220 V3.26, HS220-LA 4.6, HS220-BL 4.6 and KL125. Affected is an unknown function of the component Local Device Communication Protocol. The manipulation results in authentication replay. This vulnerability is reported as CVE-2026-76784. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in TP-Link HS103P3, HS103P4 v5, EP10, EP25 V2, HS300 V2, KP303 V2, EP40A, KP125MP2, KP125MP4, KP115, KS225, EP40M, KS205, KS240, ES20M, KS220M, KP200 V3, HS200 V5.26, HS220-LA 6.6, HS220-BL 6.6, HS220 V3.26, HS220-LA 4.6, HS220-BL 4.6 and KL125. Affected is some unknown functionality of the component Local Device Communication Protocol. The manipulation with an unknown input leads to a authentication replay vulnerability. CWE is classifying the issue as CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Multiple TP-Link Kasa smart home devices contain insufficient cryptographic protections in the local device communication protocol. An adjacent network attacker may intercept, replay or forge locally exchanged control messages, potentially resulting in unauthorized device control. Successful exploitation could allow an attacker to manipulate the operational state of an affected device, resulting in unauthorized state changes, disruption of normal device functionality or a denial-of-service condition.

The advisory is available at tp-link.com. This vulnerability is traded as CVE-2026-76784 since 08/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/26/2026). This vulnerability is assigned to T1040 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• TP-Link

Name

• EP10
• EP25 V2
• EP40A
• EP40M
• ES20M
• HS103P3
• HS103P4 v5
• HS200 V5.26
• HS220 V3.26
• HS220-BL 4.6
• HS220-BL 6.6
• HS220-LA 4.6
• HS220-LA 6.6
• HS300 V2
• KL125
• KP115
• KP125MP2
• KP125MP4
• KP200 V3
• KP303 V2
• KS205
• KS220M
• KS225
• KS240

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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Entryinfo

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