CVE-2021-0671

Local privilege escalation via missing bounds check

Published Nov 18, 2021 · Updated Aug 3, 2024

Memory corruption in MediaTek apusys on affected Android 10 chipsets allows local users with System execution privileges to elevate privileges. The apusys component omits a bounds check before a memory operation, allowing attacker-controlled values to corrupt memory; MediaTek has not disclosed the affected function or buffer. Exploitation is local, requires System execution privileges, and needs no user interaction on affected devices.

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

Memory corruption in MediaTek apusys on affected Android 10 chipsets allows local users with System execution privileges to elevate privileges. The apusys component omits a bounds check before a memory operation, allowing attacker-controlled values to corrupt memory; MediaTek has not disclosed the affected function or buffer. Exploitation is local, requires System execution privileges, and needs no user interaction on affected devices.

The record

CVE
CVE-2021-0671
Published
Nov 18, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1404
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Nov 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2NVDAV:L/AC:L/Au:N/C:C/I:C/A:C
6.7NVDCVSS:3.1/AV:L/AC:L/PR:H/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 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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1404Exploitation 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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