CVE-2026-76784: Insufficient Cryptographic Protections in Local Device Communication Protocol on Multiple TP-Link Kasa Smart Home Devices

Severity: high (CVSS 8.7 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-26 · updated 2026-08-28
Weakness: CWE-325

Description

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.

Affected products

TP-Link Systems Inc. EP10: before 1.1.1 Build 250908 Rel.112508 — fixed in 1.1.1 Build 250908 Rel.112508
TP-Link Systems Inc. EP25 V2: before 1.0.3 Build 240529 Rel.145252 — fixed in 1.0.3 Build 240529 Rel.145252
TP-Link Systems Inc. EP40A: before 1.1.1 Build 250908 Rel.112526 — fixed in 1.1.1 Build 250908 Rel.112526
TP-Link Systems Inc. EP40M: before 1.1.0 Build 240415 Rel.171219 — fixed in 1.1.0 Build 240415 Rel.171219
TP-Link Systems Inc. ES20M: before 1.1.6 Build 250522 Rel.210254 — fixed in 1.1.6 Build 250522 Rel.210254
TP-Link Systems Inc. HS103P3 / HS103P4 v5: before 1.1.3 Build 250908 Rel.112508 — fixed in 1.1.3 Build 250908 Rel.112508
TP-Link Systems Inc. HS200 V5.26: before 1.0.3 Build 240723 Rel.192622 — fixed in 1.0.3 Build 240723 Rel.192622
TP-Link Systems Inc. HS220-LA(US) 4.6 / HS220-BL(US) 4.6: before 1.1.1 Build 240802 Rel.094142 — fixed in 1.1.1 Build 240802 Rel.094142
TP-Link Systems Inc. HS220-LA(US) 6.6 / HS220-BL(US) 6.6: before 1.0.3 Build 240723 Rel.192630 — fixed in 1.0.3 Build 240723 Rel.192630
TP-Link Systems Inc. HS220 V3.26: before 1.1.1 Build 240802 Rel.094131 — fixed in 1.1.1 Build 240802 Rel.094131
TP-Link Systems Inc. HS300 v2: before 1.1.2 Build 241220 Rel.171333 — fixed in 1.1.2 Build 241220 Rel.171333
TP-Link Systems Inc. KL125: before 1.1.1 Build 260710 Rel.082646 — fixed in 1.1.1 Build 260710 Rel.082646
TP-Link Systems Inc. KP115: before 1.1.1 Build 250908 Rel.112945 — fixed in 1.1.1 Build 250908 Rel.112945
TP-Link Systems Inc. KP125MP2 / KP125MP4: before 1.2.5 Build 241213 Rel.172504 — fixed in 1.2.5 Build 241213 Rel.172504
TP-Link Systems Inc. KP200 v3: before 1.1.0 Build 250225 Rel.171724 — fixed in 1.1.0 Build 250225 Rel.171724
TP-Link Systems Inc. KP303 v2: before 1.1.2 Build 241220 Rel.173321 — fixed in 1.1.2 Build 241220 Rel.173321
TP-Link Systems Inc. KS205: before 1.1.1 Build 240724 Rel.105920 — fixed in 1.1.1 Build 240724 Rel.105920
TP-Link Systems Inc. KS220M: before 1.1.6 Build 250522 Rel.210254 — fixed in 1.1.6 Build 250522 Rel.210254
TP-Link Systems Inc. KS225: before 1.1.1 Build 240626 Rel.175125 — fixed in 1.1.1 Build 240626 Rel.175125
TP-Link Systems Inc. KS240: before 1.0.6 Build 240122 Rel.160100 — fixed in 1.0.6 Build 240122 Rel.160100

How to fix

Upgrade to a fixed version: TP-Link Systems Inc. EP10 1.1.1 Build 250908 Rel.112508; TP-Link Systems Inc. EP25 V2 1.0.3 Build 240529 Rel.145252; TP-Link Systems Inc. EP40A 1.1.1 Build 250908 Rel.112526; TP-Link Systems Inc. EP40M 1.1.0 Build 240415 Rel.171219; TP-Link Systems Inc. ES20M 1.1.6 Build 250522 Rel.210254; TP-Link Systems Inc. HS103P3 / HS103P4 v5 1.1.3 Build 250908 Rel.112508; TP-Link Systems Inc. HS200 V5.26 1.0.3 Build 240723 Rel.192622; TP-Link Systems Inc. HS220-LA(US) 4.6 / HS220-BL(US) 4.6 1.1.1 Build 240802 Rel.094142; TP-Link Systems Inc. HS220-LA(US) 6.6 / HS220-BL(US) 6.6 1.0.3 Build 240723 Rel.192630; TP-Link Systems Inc. HS220 V3.26 1.1.1 Build 240802 Rel.094131; TP-Link Systems Inc. HS300 v2 1.1.2 Build 241220 Rel.171333; TP-Link Systems Inc. KL125 1.1.1 Build 260710 Rel.082646. Check the vendor advisory for mitigations.

References

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