CVE-2023-40634

Local privilege escalation via missing permission check

Published Oct 8, 2023 · Updated Sep 19, 2024

Missing authorization in phasechecksercer on affected UNISOC chipsets running Android 11 through 13 allows local users to escalate privileges. UNISOC identifies a missing permission check but has not disclosed the checked operation, entry point, or omitted permission. Local access is required, and exploitation grants elevated privileges without additional execution privileges.

CVSS severity4.0
Medium
EPSS probability0.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in phasechecksercer on affected UNISOC chipsets running Android 11 through 13 allows local users to escalate privileges. UNISOC identifies a missing permission check but has not disclosed the checked operation, entry point, or omitted permission. Local access is required, and exploitation grants elevated privileges without additional execution privileges.

The record

CVE
CVE-2023-40634
Published
Oct 8, 2023
Updated
Sep 19, 2024
Vendor
UNISOC
Product
UNISOC T610
Classifications
CWE-200, CWE-862, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 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?

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

  1. Affected versionversion=android_11_12_13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

UNISOC · UNISOC T610version=android_11_12_13
UNISOC · UNISOC SC7731Eversion=android_11_12_13
UNISOC · UNISOC T310version=android_11_12_13
UNISOC · UNISOC T616version=android_11_12_13
UNISOC · UNISOC T770version=android_11_12_13
UNISOC · UNISOC T820version=android_11_12_13
UNISOC · UNISOC T618version=android_11_12_13
UNISOC · UNISOC SC9832Eversion=android_11_12_13
UNISOC · UNISOC SC9863Aversion=android_11_12_13
UNISOC · UNISOC T612version=android_11_12_13
UNISOC · UNISOC T760version=android_11_12_13
UNISOC · UNISOC T606version=android_11_12_13
UNISOC · UNISOC S8000version=android_11_12_13

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0UNISOCCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-862Missing Authorization
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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