CVE-2020-0105

Lock-screen key access via unchecked state toggle

Published May 14, 2020 · Updated Aug 4, 2024

Missing authorization in Android 9 and 10 Keystore allows local users to use keyguard-bound keys while the screen is locked. The onKeyguardVisibilityChanged handler in key_store_service.cpp accepts unprivileged calls that toggle Keymaster's locked state after first unlock. Any installed app can trigger the transition without extra execution privileges or user interaction, exposing key operations intended to require an unlocked screen.

CVSS severity7.8
High
EPSS probability0.14%
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 Android 9 and 10 Keystore allows local users to use keyguard-bound keys while the screen is locked. The onKeyguardVisibilityChanged handler in key_store_service.cpp accepts unprivileged calls that toggle Keymaster's locked state after first unlock. Any installed app can trigger the transition without extra execution privileges or user interaction, exposing key operations intended to require an unlocked screen.

The record

CVE
CVE-2020-0105
Published
May 14, 2020
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-862, CWE-269, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 14, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 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?

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

  1. Affected versionversion=Android-9 Android-10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Google Cloud · Androidversion=Android-9 Android-10

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-269Improper Privilege Management
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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