CVE-2023-20635

Local information disclosure via integer underflow

Published Mar 7, 2023 · Updated Mar 5, 2025

Integer underflow in MediaTek keyinstall on listed chipsets running Android 10.0 through 13.0 allows local users to disclose information. The bulletin identifies an integer wrap in keyinstall but does not disclose the affected function, arithmetic operation, input, or data exposed. Exploitation requires System execution privileges, needs no user interaction, and is limited to local information disclosure.

CVSS severity4.4
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in MediaTek keyinstall on listed chipsets running Android 10.0 through 13.0 allows local users to disclose information. The bulletin identifies an integer wrap in keyinstall but does not disclose the affected function, arithmetic operation, input, or data exposed. Exploitation requires System execution privileges, needs no user interaction, and is limited to local information disclosure.

The record

CVE
CVE-2023-20635
Published
Mar 7, 2023
Updated
Mar 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-191
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.4NIST NVDCVSS:3.1/AV:L/AC:L/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.

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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-191Integer Underflow (Wrap or Wraparound)

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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