CVE-2023-20743

Local privilege escalation via improperly locked VCU write

Published Jun 6, 2023 · Updated Jan 7, 2025

Out-of-bounds write in MediaTek VCU software for Android 12.0, 13.0, and Yocto 4.0 allows local users to escalate privileges. Improper locking in the VCU permits an out-of-bounds memory write when concurrent operations access shared state. Exploitation requires System execution privileges, needs no user interaction, and can elevate code locally within affected devices.

CVSS severity6.7
Medium
EPSS probability0.07%
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 VCU software for Android 12.0, 13.0, and Yocto 4.0 allows local users to escalate privileges. Improper locking in the VCU permits an out-of-bounds memory write when concurrent operations access shared state. Exploitation requires System execution privileges, needs no user interaction, and can elevate code locally within affected devices.

The record

CVE
CVE-2023-20743
Published
Jun 6, 2023
Updated
Jan 7, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-662, CWE-667, T1404, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 7, 2025Record 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

6.7CISA ADP VulnrichmentCVSS: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.

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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-662Improper Synchronization
CWE-667Improper Locking
T1404Exploitation for Privilege Escalation
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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