High

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

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.

Published Aug 26, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: TPLink

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1
Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.2%

ahead of 9% of scored CVEs · Oct 15, 2026

Affects

TP-Link Systems Inc.

EP10 and 19 more

CVSS base

8.7

High · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (TP-Link Systems Inc. EP10, TP-Link Systems Inc. EP25 V2, TP-Link Systems Inc. EP40A…).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

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

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Adjacent

Attack complexity

Low

Attack requirements

None

Privileges required

None

User interaction

None

Scope

Confidentiality (vulnerable system)

High

Integrity (vulnerable system)

High

Availability (vulnerable system)

High

Confidentiality (subsequent)

None

Integrity (subsequent)

None

Availability (subsequent)

None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
8.7	CVSS 4.0	High	—	—	f23511db-6c3e-4e32-a477-6aa17d310630 via NIST National Vulnerability Database
8.7	CVSS 4.0	High	—	—	TPLink via CVE Program (cve.org) e CISA ADP

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

(score shown at the top: f23511db-6c3e-4e32-a477-6aa17d310630)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-325

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Affected products added · tp-link systems inc./hs103p3 / hs103p4 v5, tp-link systems inc./ep10, tp-link systems inc./ep25 v2, tp-link systems inc.
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 8.7
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Awaiting Analysis
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Aug 26, 2026 · TPLink

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

4 on the record

www.tp-link.com/en/support/download/
patch, NIST National Vulnerability Database
www.tp-link.com/us/support/download/
patch, NIST National Vulnerability Database
www.tp-link.com/in/support/download/
patch, NIST National Vulnerability Database
www.tp-link.com/us/support/faq/5267/
vendor-advisory, NIST National Vulnerability Database

Elsewhere on this site

TP-Link Systems Inc.
every CVE for this vendor

CWE-325
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-108473 Improper Authentication and Credential Exposure in Multiple TP-Link Kasa Devices 2d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-76784 is "Insufficient Cryptographic Protections in Local Device Communication Protocol on Multiple TP-Link Kasa Smart Home Devices", rated High. It affects EP10 (TP-Link Systems Inc.); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 8.7 describes technical severity. EPSS 0.20% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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