CVE-2021-0466

Device tracking via stable IPv6 link-local identifier

Published Jun 11, 2021 · Updated Aug 3, 2024

Information disclosure in Google Cloud Android 10 Wi-Fi networking allows physically proximate attackers to track a device through IPv6 traffic. ClientModeImpl.startIpClient applies RFC 7217 stable-privacy IPv6 link-local address generation even when per-network MAC randomization is enabled. No privileges or user interaction are required, but the attacker must be close enough to observe the device's network traffic; the disclosed identifier enables cross-network correlation rather than data access.

CVSS severity7.5
High
EPSS probability1.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Google Cloud Android 10 Wi-Fi networking allows physically proximate attackers to track a device through IPv6 traffic. ClientModeImpl.startIpClient applies RFC 7217 stable-privacy IPv6 link-local address generation even when per-network MAC randomization is enabled. No privileges or user interaction are required, but the attacker must be close enough to observe the device's network traffic; the disclosed identifier enables cross-network correlation rather than data access.

The record

CVE
CVE-2021-0466
Published
Jun 11, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-330, T1420
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 11, 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?

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

  1. Affected versionversion=Android-10

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Google Cloud · Androidversion=Android-10

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/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.

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-330Use of Insufficiently Random Values
T1420Network Sniffing

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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