CVE-2021-0475

Remote code execution via Bluetooth L2CAP use-after-free

Published Jun 11, 2021 · Updated Aug 3, 2024

Use-after-free in Android 10 and 11 Bluetooth L2CAP allows remote attackers to execute code via crafted Bluetooth data. The on_l2cap_data_ind function in btif_sock_l2cap.cc accesses memory after it has been freed, causing memory corruption that can be steered into code execution. Attackers need Bluetooth proximity but no authentication, additional privileges, or user interaction; successful exploitation can compromise confidentiality, integrity, and availability.

CVSS severity8.8
High
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Android 10 and 11 Bluetooth L2CAP allows remote attackers to execute code via crafted Bluetooth data. The on_l2cap_data_ind function in btif_sock_l2cap.cc accesses memory after it has been freed, causing memory corruption that can be steered into code execution. Attackers need Bluetooth proximity but no authentication, additional privileges, or user interaction; successful exploitation can compromise confidentiality, integrity, and availability.

The record

CVE
CVE-2021-0475
Published
Jun 11, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-416, T1210
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-11 Android-10

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Google Cloud · Androidversion=Android-11 Android-10

Published CVSS scores

8.8NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.3NVDAV:A/AC:L/Au:N/C:C/I:C/A:C

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1210Exploitation of Remote Services

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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