CVE-2021-39641Network attack vector

Privilege escalation

Published Dec 15, 2021 · Updated Aug 4, 2024

Elevation of privilege in Google Pixel Bootloader allows remote attackers to gain elevated privileges through an undisclosed attack path. Google has not published the affected bootloader locus or the operation it performs incorrectly on untrusted input. NVD represents the path as unauthenticated and requiring no user interaction, while the resulting privilege level and required device state remain undisclosed.

CVSS severity9.8
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Elevation of privilege in Google Pixel Bootloader allows remote attackers to gain elevated privileges through an undisclosed attack path. Google has not published the affected bootloader locus or the operation it performs incorrectly on untrusted input. NVD represents the path as unauthenticated and requiring no user interaction, while the resulting privilege level and required device state remain undisclosed.

The record

CVE
CVE-2021-39641
Published
Dec 15, 2021
Updated
Aug 4, 2024
Vendor
Google
Product
Pixel Bootloader
Classifications
T1626
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

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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

T1626Exploitation for Privilege Escalation

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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