CVE-2023-20839

Local memory disclosure via unchecked imgsys range

Published Sep 4, 2023 · Updated Oct 8, 2024

Out-of-bounds read in MediaTek imgsys on affected chipsets allows local users with System privileges to disclose memory via local processing. The imgsys component reads beyond a valid memory range because it fails to validate that range before accessing memory; MediaTek has not disclosed the exact input or function. Exploitation requires System privileges and user interaction on Android 11.0 and 12.0, Linux 6.1, IOT-v23.0, or Yocto 4.0.

CVSS severity4.2
Medium
EPSS probability0.10%
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 read in MediaTek imgsys on affected chipsets allows local users with System privileges to disclose memory via local processing. The imgsys component reads beyond a valid memory range because it fails to validate that range before accessing memory; MediaTek has not disclosed the exact input or function. Exploitation requires System privileges and user interaction on Android 11.0 and 12.0, Linux 6.1, IOT-v23.0, or Yocto 4.0.

The record

CVE
CVE-2023-20839
Published
Sep 4, 2023
Updated
Oct 8, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 8, 2024Record 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

4.2NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:R/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.

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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-125Out-of-bounds Read

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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