CVE-2021-39646Network attack vector

Information disclosure from bootloader

Published Dec 15, 2021 · Updated Aug 4, 2024

Information disclosure in Google Pixel Bootloader allows attackers to access unspecified information via unspecified vectors. Google identifies the affected locus only as the bootloader and keeps the referenced issue private, so the operation that exposes data is undisclosed. Public records do not identify the required access conditions or the specific information exposed, limiting impact assessment to information disclosure.

CVSS severity7.5
High
EPSS probability0.41%
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 Pixel Bootloader allows attackers to access unspecified information via unspecified vectors. Google identifies the affected locus only as the bootloader and keeps the referenced issue private, so the operation that exposes data is undisclosed. Public records do not identify the required access conditions or the specific information exposed, limiting impact assessment to information disclosure.

The record

CVE
CVE-2021-39646
Published
Dec 15, 2021
Updated
Aug 4, 2024
Vendor
Google
Product
Pixel Bootloader
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 15, 2021CVE 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Google · Pixel Bootloaderversion=Android kernel

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NVDCVSS:3.1/AV:N/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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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