CVE-2023-20686

Local privilege escalation via DRM double free

Published Apr 6, 2023 · Updated Feb 12, 2025

Improper synchronization in MediaTek display DRM on Android 12.0 and 13.0 allows local users to escalate privileges through a race. Concurrent access in the display DRM component can free the same allocation twice, but MediaTek has not disclosed the affected function or shared object. Exploitation requires local access with System execution privileges, needs no user interaction, and affects MT6879, MT6895, MT6983, and MT8781 chipsets.

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 MediaTek display DRM on Android 12.0 and 13.0 allows local users to escalate privileges through a race. Concurrent access in the display DRM component can free the same allocation twice, but MediaTek has not disclosed the affected function or shared object. Exploitation requires local access with System execution privileges, needs no user interaction, and affects MT6879, MT6895, MT6983, and MT8781 chipsets.

The record

CVE
CVE-2023-20686
Published
Apr 6, 2023
Updated
Feb 12, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, CWE-662, 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

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

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

6.4INCIBE-CERTCVSS: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 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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-662Improper Synchronization
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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