CVE-2023-42655

Local privilege escalation via unchecked usage-record writes

Published Nov 1, 2023 · Updated Sep 5, 2024

Missing authorization in UNISOC sim service on T760, T770, T820, and S8000 Android 11 devices allows local users to escalate privileges. The service writes an app's permission-usage records without checking the caller's permission, enabling unauthorized modification of security-relevant records. Local access and user interaction are required; UNISOC's prose says System privileges are needed, while its vector states no prior privileges.

CVSS severity4.4
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 UNISOC sim service on T760, T770, T820, and S8000 Android 11 devices allows local users to escalate privileges. The service writes an app's permission-usage records without checking the caller's permission, enabling unauthorized modification of security-relevant records. Local access and user interaction are required; UNISOC's prose says System privileges are needed, while its vector states no prior privileges.

The record

CVE
CVE-2023-42655
Published
Nov 1, 2023
Updated
Sep 5, 2024
Vendor
UNISOC
Product
UNISOC T770
Classifications
CWE-862, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 5, 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=Android11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

UNISOC · UNISOC T770version=Android11
UNISOC · UNISOC T820version=Android11
UNISOC · UNISOC T760version=Android11
UNISOC · UNISOC S8000version=Android11

Published CVSS scores

6.7NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.4UNISOCCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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