CVE-2023-20655

Local privilege escalation via parcel format mismatch

Published Apr 6, 2023 · Updated Mar 17, 2025

Privilege escalation in MediaTek mmsdk on Android 10.0 through 13.0 allows local users to execute code via a malformed parcel. mmsdk processes a parcel whose format does not match the expected representation, causing its contents to be interpreted incorrectly. A local low-privileged process can trigger elevated code execution without user interaction; MediaTek has not disclosed further code-level details.

CVSS severity7.8
High
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in MediaTek mmsdk on Android 10.0 through 13.0 allows local users to execute code via a malformed parcel. mmsdk processes a parcel whose format does not match the expected representation, causing its contents to be interpreted incorrectly. A local low-privileged process can trigger elevated code execution without user interaction; MediaTek has not disclosed further code-level details.

The record

CVE
CVE-2023-20655
Published
Apr 6, 2023
Updated
Mar 17, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-269, CWE-20, T1404
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 17, 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 privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CISACVSS:3.1/AV:L/AC:L/PR:L/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
CWE-20Improper Input Validation
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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