CVE-2026-66404Network attack vector

Log disclosure via unvalidated MQTT server certificates

Published Aug 10, 2026 · Updated Aug 10, 2026

Improper certificate validation in DEEBOT PRO M1 and DEEBOT PRO K1VAC allows man-in-the-middle attackers to retrieve device logs. The MQTT client establishes communications without validating the presented server certificate, allowing an on-path broker to impersonate the intended service. Reachability requires interception of the robot's MQTT path, and the published impact is retrieval of stored operation and activity logs.

CVSS severity6.0
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in DEEBOT PRO M1 and DEEBOT PRO K1VAC allows man-in-the-middle attackers to retrieve device logs. The MQTT client establishes communications without validating the presented server certificate, allowing an on-path broker to impersonate the intended service. Reachability requires interception of the robot's MQTT path, and the published impact is retrieval of stored operation and activity logs.

The record

CVE
CVE-2026-66404
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
ECOVACS Robotics Co., Ltd.
Product
DEEBOT PRO K1 VAC
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <V1.7.821

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ECOVACS Robotics Co., Ltd. · DEEBOT PRO K1 VACversion=0 <V1.7.821
ECOVACS Robotics Co., Ltd. · DEEBOT PRO M1version=0 <M1-1.7.27

Published CVSS scores

6.0JPCERT/CCCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
6.5JPCERT/CCCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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