CVE-2018-6402

Traffic exposure via stronger unencrypted evil twin

Published Apr 14, 2020 · Updated Aug 5, 2024

Cryptographic downgrade in Ecobee Ecobee4 4.2.0.171 allows physically proximate attackers to redirect Wi-Fi traffic via an evil twin. The Wi-Fi connection logic accepts a stronger unencrypted network matching the configured SSID despite WPA2 being configured. Exploitation requires forced deauthentication and a nearby attacker-controlled access point, after which the device connects without encryption.

CVSS severity7.5
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cryptographic downgrade in Ecobee Ecobee4 4.2.0.171 allows physically proximate attackers to redirect Wi-Fi traffic via an evil twin. The Wi-Fi connection logic accepts a stronger unencrypted network matching the configured SSID despite WPA2 being configured. Exploitation requires forced deauthentication and a nearby attacker-controlled access point, after which the device connects without encryption.

The record

CVE
CVE-2018-6402
Published
Apr 14, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-327, T1557.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.9NVDAV:A/AC:M/Au:N/C:P/I:N/A:N
7.5NVDCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
T1557.004Evil Twin

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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