CVE-2023-20620

System privilege escalation via adsp TOCTOU race

Published Mar 7, 2023 · Updated Mar 6, 2025

A TOCTOU race in MediaTek adsp on MT6879, MT6895, and MT6983 chipsets with Android 12.0 or 13.0 allows local users to gain System privileges. The adsp component performs a security-sensitive check and later use across a race window, but MediaTek has not disclosed the affected function, checked object, or competing operation. Exploitation requires existing System execution privileges, involves no user interaction, and is limited to the listed chipsets and Android releases.

CVSS severity4.1
Medium
EPSS probability0.07%
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

A TOCTOU race in MediaTek adsp on MT6879, MT6895, and MT6983 chipsets with Android 12.0 or 13.0 allows local users to gain System privileges. The adsp component performs a security-sensitive check and later use across a race window, but MediaTek has not disclosed the affected function, checked object, or competing operation. Exploitation requires existing System execution privileges, involves no user interaction, and is limited to the listed chipsets and Android releases.

The record

CVE
CVE-2023-20620
Published
Mar 7, 2023
Updated
Mar 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-367, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 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

4.1NIST NVDCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N

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-367Time-of-check Time-of-use (TOCTOU) Race Condition
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