CVE-2021-0626

Local privilege escalation via unchecked buffer write

Published Aug 18, 2021 · Updated Aug 3, 2024

Out-of-bounds write in MediaTek GPU Extension Device on Android 9.0 through 11.0 allows local users to escalate privileges. GED processes an unspecified input without the required bounds check, allowing a write beyond the intended buffer; the vendor has not published the affected function or input path. Exploitation is local, requires System execution privileges, and needs no user interaction; the bounded impact is further privilege escalation on affected MediaTek chipsets.

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 MediaTek GPU Extension Device on Android 9.0 through 11.0 allows local users to escalate privileges. GED processes an unspecified input without the required bounds check, allowing a write beyond the intended buffer; the vendor has not published the affected function or input path. Exploitation is local, requires System execution privileges, and needs no user interaction; the bounded impact is further privilege escalation on affected MediaTek chipsets.

The record

CVE
CVE-2021-0626
Published
Aug 18, 2021
Updated
Aug 3, 2024
Vendor
MediaTek
Product
GPU Extension Device (GED)
Classifications
CWE-787, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 18, 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 9.0, 10.0, 11.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

MediaTek · GPU Extension Device (GED)version=Android 9.0, 10.0, 11.0

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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