CVE-2023-20687

Local privilege escalation via display DRM double free

Published Apr 6, 2023 · Updated Feb 12, 2025

Improper synchronization in display DRM on MediaTek chipsets running Android 12.0 and 13.0 allows local users to escalate privileges. Concurrent display DRM operations can free the same allocation twice because access is not synchronized. Exploitation requires local System-level execution privileges and no user interaction; MediaTek has not disclosed the affected function or resulting privilege level.

CVSS severity6.4
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

Improper synchronization in display DRM on MediaTek chipsets running Android 12.0 and 13.0 allows local users to escalate privileges. Concurrent display DRM operations can free the same allocation twice because access is not synchronized. Exploitation requires local System-level execution privileges and no user interaction; MediaTek has not disclosed the affected function or resulting privilege level.

The record

CVE
CVE-2023-20687
Published
Apr 6, 2023
Updated
Feb 12, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-662, CWE-362, T1404
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 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

6.4CISA-ADPCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
6.4NIST NVDCVSS:3.1/AV:L/AC:H/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 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-662Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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