CVE-2023-20809

System privilege escalation via unchecked vdec writes

Published Aug 7, 2023 · Updated Oct 22, 2024

Out-of-bounds write in MediaTek vdec on Android 10.0 and 11.0 allows local users with System privileges to escalate privileges. The vdec component writes beyond an intended buffer because it omits a required bounds check before the write. Exploitation requires System execution privileges on a device with a listed MediaTek chipset, and no user interaction is required.

CVSS severity6.7
Medium
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

Out-of-bounds write in MediaTek vdec on Android 10.0 and 11.0 allows local users with System privileges to escalate privileges. The vdec component writes beyond an intended buffer because it omits a required bounds check before the write. Exploitation requires System execution privileges on a device with a listed MediaTek chipset, and no user interaction is required.

The record

CVE
CVE-2023-20809
Published
Aug 7, 2023
Updated
Oct 22, 2024
Vendor
MediaTek
Product
MediaTek MT9652
Classifications
CWE-787, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2024Record 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

MediaTek · MediaTek MT9652version=0 <=*
MediaTek · MT9016version=0 <=*
MediaTek · MediaTek MT9688version=0 <=*
MediaTek · MT9632version=0 <=*
MediaTek · MT9630version=0 <=*
MediaTek · MT9022version=0 <=*
MediaTek · MT9288version=0 <=*
MediaTek · MT5695version=0 <=*
MediaTek · MT9222version=0 <=*
MediaTek · MT9631version=0 <=*
MediaTek · MT9629version=0 <=*
MediaTek · MT9612version=0 <=*
MediaTek · MT5691version=0 <=*
MediaTek · MT9636version=0 <=*
MediaTek · MT9032version=0 <=*
MediaTek · MT9286version=0 <=*
MediaTek · MT9021version=0 <=*
MediaTek · MT9030version=0 <=*
MediaTek · MT9602version=0 <=*
MediaTek · MT9638version=0 <=*
MediaTek · MT9617version=0 <=*
MediaTek · MT9011version=0 <=*
MediaTek · MediaTek MT9667version=0 <=*
MediaTek · MediaTek MT9666version=0 <=*
MediaTek · MT9600version=0 <=*
MediaTek · MT9611version=0 <=*
MediaTek · MT9285version=0 <=*
MediaTek · MT9255version=0 <=*
MediaTek · MT9010version=0 <=*
MediaTek · MT9031version=0 <=*
MediaTek · MT9615version=0 <=*
MediaTek · MediaTek MT9670version=0 <=*
MediaTek · MT9220version=0 <=*
MediaTek · MediaTek MT9671version=0 <=*
Google · Androidversion=10.0; version=11.0
MediaTek · MediaTek MT9685version=0 <=*
MediaTek · MT9221version=0 <=*
MediaTek · MT9610version=0 <=*
MediaTek · MediaTek MT9686version=0 <=*
MediaTek · MT9256version=0 <=*
MediaTek · MediaTek MT9669version=0 <=*
MediaTek · MT9613version=0 <=*
MediaTek · MT9216version=0 <=*
MediaTek · MediaTek MT9650version=0 <=*
MediaTek · MediaTek MT9675version=0 <=*
MediaTek · MT9215version=0 <=*
MediaTek · MT9020version=0 <=*
MediaTek · MediaTek MT9639version=0 <=*
MediaTek · MT9266version=0 <=*
MediaTek · MT9012version=0 <=*
MediaTek · MT9269version=0 <=*
MediaTek · MT5583version=0 <=*
MediaTek · MT9218version=0 <=*

Published CVSS scores

6.7NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.7CISA-ADPCVSS: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-787Out-of-bounds Write
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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