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CVE-2021-32727

5.7 · MEDIUM

Nextcloud Android Client is the Android client for Nextcloud.

Published Jul 12, 2021CWE-295EPSS 0.73%

Overview

CVE-2021-32727 is a medium-severity vulnerability. It was published on July 12, 2021 and has a CVSS 3.1 base score of 5.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client checking if a private key belonged to a previously downloaded public certificate. If the Nextcloud instance served a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. The vulnerability is patched in version 3.16.1. As a workaround, do not add additional end-to-end encrypted devices to a user account.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/nextcloud/android/pull/8438GitHubgithub.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devicesGitHubgithub.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736Refhackerone.com/reports/1189162GitHubgithub.com/nextcloud/android/pull/8438GitHubgithub.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devicesGitHubgithub.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736Refhackerone.com/reports/1189162

How CyberStrike helps

Frequently asked questions

What is CVE-2021-32727?

CVE-2021-32727 is a medium-severity vulnerability. It was published on July 12, 2021 and has a CVSS 3.1 base score of 5.7 (MEDIUM).

How severe is CVE-2021-32727?

This vulnerability has a CVSS 3.1 base score of 5.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-32727?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-32727?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-32727 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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