CVE-2021-43863

Name: CVE-2021-43863
Creator: NVD / NIST
Published: 2022-01-25T16:15:08.74+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.87%

Last modified Jun 17, 2026

CVE-2021-43863 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The Nextcloud Android app is the Android client for Nextcloud, a self-hosted productivity platform. The Nextcloud Android app uses content providers to manage its data. EPSS estimates a 1.87% chance of exploitation in the next 30 days.

Description

The Nextcloud Android app is the Android client for Nextcloud, a self-hosted productivity platform. The Nextcloud Android app uses content providers to manage its data. Prior to version 3.18.1, the providers `FileContentProvider` and `DiskLruImageCacheFileProvider` have security issues (an SQL injection, and an insufficient permission control, respectively) that allow malicious apps in the same device to access Nextcloud's data bypassing the permission control system. Users should upgrade to version 3.18.1 to receive a patch. There are no known workarounds aside from upgrading.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.87%

76.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud	< 3.18.1

References

https://github.com/nextcloud/android/commit/627caba60e69e223b0fc89c4cb18eaa76a95db95Patch, Third Party Advisory
https://github.com/nextcloud/android/security/advisories/GHSA-vjp2-f63v-w479Third Party Advisory
https://hackerone.com/reports/1358597Permissions Required
https://github.com/nextcloud/android/commit/627caba60e69e223b0fc89c4cb18eaa76a95db95Patch, Third Party Advisory
https://github.com/nextcloud/android/security/advisories/GHSA-vjp2-f63v-w479Third Party Advisory
https://hackerone.com/reports/1358597Permissions Required

Timeline

Published: Jan 25, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43863?

How severe is CVE-2021-43863?

CVE-2021-43863 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.87% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43863?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43863?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST