In shouldBlockFromTree of ExternalStorageProvider.java, there is a possible permissions bypass.

published 2021-08-17 5y ago modified 2026-06-17 4mo ago also EUVD-2021-3264

cvss: 7.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits: 0; none known

In shouldBlockFromTree of ExternalStorageProvider.java, there is a possible permissions bypass. This could lead to local escalation of privilege, allowing an app to read private app directories in external storage, which should be restricted in Android 11, with no additional execution privileges needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-157320644

Patch / fix

links 1

source.android.com/security/bulletin/2021-08-01 advisory

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Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

n/a Android

Classification

Weakness

CWE-863 Incorrect Authorization

References

source.android.com /security/bulletin/2021-08-01
patch, vendor-advisory

Sources

CVE List CVE-2021-0645
NVD CVE-2021-0645

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