CVE-2021-39687

Local information disclosure via heap buffer over-read

Published Feb 11, 2022 · Updated Aug 4, 2024

Heap buffer overflow in the Camera component of Google Pixel Android kernel devices allows local users to disclose memory contents. HandleTransactionIoEvent in actuator_driver.cc reads beyond a heap buffer while handling a transaction I/O event. A locally installed application can trigger the read without additional execution privileges or user interaction, exposing only memory data available through the over-read.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in the Camera component of Google Pixel Android kernel devices allows local users to disclose memory contents. HandleTransactionIoEvent in actuator_driver.cc reads beyond a heap buffer while handling a transaction I/O event. A locally installed application can trigger the read without additional execution privileges or user interaction, exposing only memory data available through the over-read.

The record

CVE
CVE-2021-39687
Published
Feb 11, 2022
Updated
Aug 4, 2024
Vendor
Google
Product
Google Pixel
Classifications
CWE-125, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 kernel

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google · Google Pixelversion=Android kernel

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.1NVDAV:L/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.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1005Data from Local System

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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