CVE-2021-0456

Local privilege escalation via missing bounds check

Published Mar 10, 2021 · Updated Aug 3, 2024

Out-of-bounds write in Google Titan M Citadel firmware allows local users with System execution privileges to elevate privileges. The firmware writes beyond an intended buffer because a required bounds check is absent; Google has not disclosed the affected function or input path. Exploitation requires local access with existing System execution privileges and no user interaction; the higher privilege obtained is not publicly detailed.

CVSS severity6.7
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

Out-of-bounds write in Google Titan M Citadel firmware allows local users with System execution privileges to elevate privileges. The firmware writes beyond an intended buffer because a required bounds check is absent; Google has not disclosed the affected function or input path. Exploitation requires local access with existing System execution privileges and no user interaction; the higher privilege obtained is not publicly detailed.

The record

CVE
CVE-2021-0456
Published
Mar 10, 2021
Updated
Aug 3, 2024
Vendor
Google
Product
Titan M
Classifications
CWE-787, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 10, 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 kernel

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Google · Titan Mversion=Android kernel

Published CVSS scores

6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation 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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