CVE-2021-0895

Local privilege escalation via missing bounds check

Published Dec 17, 2021 · Updated Aug 3, 2024

Out-of-bounds write in MediaTek APUSYS on Android 10.0 through 12.0 allows local users with System privileges to elevate access. The APUSYS component writes beyond a memory buffer because an input-dependent bound is not checked; MediaTek has not disclosed the affected function or data path. Exploitation requires existing System execution privileges on an affected MediaTek chipset, needs no user interaction, and can corrupt memory to elevate access.

CVSS severityUnavailable
Unscored
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds write in MediaTek APUSYS on Android 10.0 through 12.0 allows local users with System privileges to elevate access. The APUSYS component writes beyond a memory buffer because an input-dependent bound is not checked; MediaTek has not disclosed the affected function or data path. Exploitation requires existing System execution privileges on an affected MediaTek chipset, needs no user interaction, and can corrupt memory to elevate access.

The record

CVE
CVE-2021-0895
Published
Dec 17, 2021
Updated
Aug 3, 2024
Vendor
MediaTek
Product
MediaTek APUSYS
Classifications
CWE-119, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Dec 17, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Android 10.0, 11.0, 12.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

MediaTek · MediaTek APUSYSversion=Android 10.0, 11.0, 12.0

Published CVSS scores

No CVSS assessment is available in this record.

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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo