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CVE-2021-32707

4.3 · MEDIUM

Nextcloud Mail is a mail app for Nextcloud.

Published Jul 12, 2021CWE-20EPSS 1.15%

Overview

CVE-2021-32707 is a medium-severity vulnerability. It was published on July 12, 2021 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Nextcloud Mail is a mail app for Nextcloud. In versions prior to 1.9.6, the Nextcloud Mail application does not, by default, render images in emails to not leak the read state. The privacy filter failed to filter images with a `background-image` CSS attribute. Note that the images were still passed through the Nextcloud image proxy, and thus there was no IP leakage. The issue was patched in version 1.9.6 and 1.10.0. No workarounds are known to exist.

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/mail/pull/5189GitHubgithub.com/nextcloud/security-advisories/security/advisories/GHSA-xxp4-44xc-8crhRefhackerone.com/reports/1215251GitHubgithub.com/nextcloud/mail/pull/5189GitHubgithub.com/nextcloud/security-advisories/security/advisories/GHSA-xxp4-44xc-8crhRefhackerone.com/reports/1215251

How CyberStrike helps

Frequently asked questions

What is CVE-2021-32707?

CVE-2021-32707 is a medium-severity vulnerability. It was published on July 12, 2021 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2021-32707?

This vulnerability has a CVSS 3.1 base score of 4.3, 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-2021-32707?

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-2021-32707?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-32707 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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