CVE-2021-39702

Local privilege escalation via credential-dialog tapjacking

Published Mar 16, 2022 · Updated Aug 4, 2024

Tapjacking in Android 12 allows local users to install credential certificates without approval through a malicious app overlay. RequestManageCredentials.onCreate fails to hide non-system overlay windows, letting an app obscure the credential-management approval screen and redirect a tap. Exploitation requires a locally installed third-party app and user interaction; successful abuse installs attacker-chosen certificates under the user's authority.

CVSS severity7.8
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Tapjacking in Android 12 allows local users to install credential certificates without approval through a malicious app overlay. RequestManageCredentials.onCreate fails to hide non-system overlay windows, letting an app obscure the credential-management approval screen and redirect a tap. Exploitation requires a locally installed third-party app and user interaction; successful abuse installs attacker-chosen certificates under the user's authority.

The record

CVE
CVE-2021-39702
Published
Mar 16, 2022
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-1021, CAPEC-506, T1626
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 16, 2022CVE 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-12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Google Cloud · Androidversion=Android-12

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9.3NIST NVDAV:N/AC:M/Au:N/C:C/I:C/A:C

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-1021Improper Restriction of Rendered UI Layers or Frames
CAPEC-506Tapjacking
T1626Abuse Elevation Control Mechanism

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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