CVE-2021-27941Public exploit

Wi-Fi credential disclosure via exposed pairing key

Published May 6, 2021 · Updated Aug 3, 2024

Credential disclosure in eWeLink 4.9.2 and earlier on Android and 4.9.1 and earlier on iOS exposes Wi-Fi credentials to physically proximate attackers. The QR pairing flow exposes the device ID in the open SoftAP SSID, then lets any valid platform account retrieve the matching AES key from a cloud API and decrypt the captured HTTP configuration message. Exploitation requires proximity during pairing and a registered account; the recovered SSID and passkey grant access to the configured Wi-Fi network.

CVSS severity4.6
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential disclosure in eWeLink 4.9.2 and earlier on Android and 4.9.1 and earlier on iOS exposes Wi-Fi credentials to physically proximate attackers. The QR pairing flow exposes the device ID in the open SoftAP SSID, then lets any valid platform account retrieve the matching AES key from a cloud API and decrypt the captured HTTP configuration message. Exploitation requires proximity during pairing and a registered account; the recovered SSID and passkey grant access to the configured Wi-Fi network.

The record

CVE
CVE-2021-27941
Published
May 6, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-522, T1040
Attack vector
physical
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectorphysical
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.6NIST NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/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)
Vectorphysical
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1040Network Sniffing

Public exploit references

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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