CVE-2023-20756

Local privilege escalation via integer-overflow write

Published Jul 4, 2023 · Updated Dec 4, 2024

Integer overflow in MediaTek keyinstall on Android 12.0 or 13.0 allows local users with System execution privileges to escalate privileges. Keyinstall performs an integer calculation that can overflow and cause an out-of-bounds memory write; MediaTek has not disclosed the affected function or buffer. Exploitation requires prior System execution privileges, needs no user interaction, and can raise the attacker's local privilege level.

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

Integer overflow in MediaTek keyinstall on Android 12.0 or 13.0 allows local users with System execution privileges to escalate privileges. Keyinstall performs an integer calculation that can overflow and cause an out-of-bounds memory write; MediaTek has not disclosed the affected function or buffer. Exploitation requires prior System execution privileges, needs no user interaction, and can raise the attacker's local privilege level.

The record

CVE
CVE-2023-20756
Published
Jul 4, 2023
Updated
Dec 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, CAPEC-92, T1404
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 4, 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

6.7NVDCVSS: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-190Integer Overflow or Wraparound
CAPEC-92Forced Integer Overflow
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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